I've got more-than-average understanding of the options in the "world" of therapeutic boarding schools and educational consulting. Most Ed.Cons. are honest, but not all. Some are nothing more than a front for a group of schools, and some are interested only in a quick buck. One well-regarded Ed.Cons. told us he wouldn't consider schools he didn't already know, and wasn't expanding his list! Others will do significant interviewing if appropriate, testing if needed, and real research to get a good "fit" --- plus they will follow-up as well. Naturally, the more service you get, the higher the likely cost. So, the better you can define the needs, the easier and less costly the service can be.
As I read it, your son asked to go to a boarding school, not a therapeutic boarding school. He may not recognize the difference, or fully understand what he is asking for other than a different place. Do learn about how any school you consider operates, perhaps visiting first, before you make a commitment. (And, I'd forget about a boot camp unless it was the one in the National Guard Youth Challenge program. According to their web site: "The National Guard Youth ChalleNGe Program, a preventive rather than remedial at-risk youth program, targets participants who are unemployed, drug-free and law-free high-school dropouts, 16 to 18 years of age.")
Some TBSs require wilderness first, but far from all. One excellent school I know advises against spending the money on wilderness. Some schools operate on a semester or similar term system, while others use supervised and guided self-study which can allow catch-up in credits. Few TBSs have what most would call strong academics because the focus is on the therapeutic aspect. (However, some schools using self-study can also do AP classes that way!)
So ... a wide range of possibilities.