The stress of planning a wedding has broken up many couples... also, there are many times a bloke has proposed (in the heat of passion) only to greatly regret it minutes later, but be ubable to reverse it all.
easy child 2/difficult child 2's new sister in law is a bit like this - every boyfriend she's ever introduced me to, is her fiance. Even a guy she had only just begun going out with, days earlier. she's the one who got pregnant (despite "being on the Pill") and caused all sorts of problems with not being able to make her bridesmaid's dress until the week before the wedding, due to the recent birth. Her "fiance" has moved in to her bedroom in her parents' home (to help mind the baby at night), and when we dropped in on them to talk weding plans I tossed a throwaway line at this bloke, thinking things were cool, only ti find the guy looking panicked and hunted.
At the wedding my MC (annd best friend) was talking to the guy, asked him when they were getting married. "Your turn next," kind of line. Again, the hunted reaction. "We're never getting married!" he announced to her. We're not serious, I'm just helping out with my daughter. This wasn't meant to happen, she was on the Pill she told me. I think she just wanted to have a baby and went off it without telling me."
So some people think one way, others think another way. And people who have a habit of self-deception will go on making the same mistakes their whole life. A girl who sees every new boyfriend as a potential life partner, is a girl with problems. And in your case, a female who considers every male in her life as provider of an instant family with no responsibilities - again, someone with big problems.
I'd go easy on the witchcraft stuff, though, because you don't want it to rebound back onto you. Over here, someone can use it to accuse you of harassment. And if the person feels threatened or harassed, even if you didn't intend it - then it is harassment. All the person has to do, is to prove that THEY felt harassed. If what you were doing, is simply getting on with your own stuff and there's no indication that anything you did was aimed in the other person's direction, then it would get thrown out. But mentioning their names etc, could get you into difficulty.
Otherwise, go for it. easy child 2/difficult child 2 did something similar in her teens, to keep certain local boys away. She used the gossip machine to allow the rumours to spread, that she was a witch who knew how to put a hex on someone. It was all rubbish, but it did have me getting a few visits from concerned church elders.
On the use of satanism as fear angle - a woman who (for a time) attached herself to our church, claimed she was being attacked by local satanists. She had quite a few problems, was using drugs on a regular basis but was a classic case of "fallen woman needing help" which reached out to the more gullible church people who wanted a pet project. So of course, more evidence of satanic attack would be provided (various hex marks painted in the road outside her rental accommodation) and there would be calls from our gullible church member asking for "hands on deck" for a prayer/exorcism session. I stayed out of it, I had a hunch as to what was really going on.
And the woman moved. Not because she was chased away by satanists, but because the rental place had been condemned and she hadn't been paying the rent, anyway.
And the hex marks began to appear outside the new accommodation. Same handwriting. Same colour paint.
I asked easy child 2/difficult child 2 what she knew (because she was in a position to hear stuff from local kids) and was told that the junkie had been seen outside her own place with a pot of paint. Seems she was giving people what they expected. The kids were avoiding her, she was "weird". It seemed to me that the junkie was using the fear factor to keep getting sympathy (and I suspect some financial assistance) from the prayer circle that got set up. When the woman finally moved away (it's called eviction for non-payment of rent, folks) the apparent haunting stopped. Which left the hysterics without a cause, so they had to go looking. All psyched up and no place to go. Which was about the time that we got approached, with messages of concern...
oh dearie, dearie me...
I know it makes me sound a cynic and an athiest. I'm not. OK, I 'fess up to the cynic bit. But more harm can come from hysteria, than can ever come from what people get hysterical about.
So go easy if you go down this route. it can come back to bite you, simply from side reactions.
Marg