Well,
If you did your research properly regarding work/instructing option after finishing training, and looked into the (NOW PHASED OUT) aviation J-1 visa, you'd know.
You didn't even know you can change your schools on M1 or get another extension at same school!!
There are 8 (IIRC) schools, mostly fixed wing, two that do both rotary and FW and one only rotary (Bristow Academy) that used to be able to issue DS-2019 form to apply for J1 visa. That'd give you two years' worth of training and instructing (IF hired) at same or other US school. Since some US govt agencies didn't want to administer J1 for aviation, the other didn't want it, so they cancelled it.
Couple big schools' bosses got together and lobbied for some sort of replacement.
Initially, the 'news' said *new kind of visa M1 for work as well* - which we know didn't mean anything.
The govt agencies decided to consider 0/PPL-CPL/IR/CFI programme equivalent to academic studies, with OPT (up to 1 year work authorisation at the end of training, but with more restrictions regarding paperwork than previous J1).
So, the F1 one can now get in past J1 schools, where you DO NOT do any academic, ie associate degree or more, technically, but do part 141 ground and flight training, blah blah, IS NOT same as other F1.
Since there is the provision of OPT, they decided it kills two birds with one stone. No harm to schools that'd lose lots of business from international students, especially Hillsboro Aviation and Bristow Academy, lots of Europeans doing heli training over there, plus no big changes in regulations, making up new visa class or category.
You probably can do another F1 associate degree, but it ain't cheap, and won't get credit (READ DISCOUNT on fees) for your CPL/IR. Also, no idea how dicey it'd be trying to work legally OFF CAMPUS, as it's not normally allowed, unless in unexpected hardship etc, the clauses. It'd all have to be applied for.
I don't see a point trying it that way. I only pointed out that it could be done via college with flight school links, as there, it'd be your 'on campus' as well, where you do part of your studies, practical flying. It's nowhere near sure deal for you.
USA isn't, in general.
Your comments about 'marrying an US gal' etc, that you don't fancy that. Ehrm, for Europeans or Asians, American women are different sort. If not a fake papers marriage (for which you'd have to pay a lot), you just aren't likely to do it just like that anyway. Good.
SH, you're definitely not eligible for post-J1 F1, as you have more than +-PPL.
Go ahead, if you believe Delta that they'd sort H-3 for you. F1 could only be done with extra cost for fees, for associate degree.
Enough on that. I see it very bleak you'd get past anywhere beyond your CFI/I and leisure flying/hourbuilding in the US should you wish so, paid out of your pocket, legally. At least the way you imagine it.