You know Scottie, as long as you're talking about something sensible, not twin 1098's and the like, making it one-arm rideable would be something I could knock up in my shed. Heck NDIS may even pay for parts / RMS certification?
Anyway, if you do get in the head-space that you could seriously tackle this thing without any bs stuff, just grit and determination, then I would be fine to 'make it a project' and see if we can get something that passes through all the hoops to make it legit.
I always thought when you get solidly out of the chair we may have a crack at this, but you seem to be increasingly stuck in the thing instead of just relying on it for long haul / big tasks, or some other kind of weaning off. I wouldn't tackle a chair to trike set-up - you can buy those. But if you are mobile enough to throw a leg over and get onto a bike, and could hold it up, then making the controls one-sided / easier for foot operation should be doable.
Very likely, one of the Hondas / whatever with linked brakes would be a good start. We can paint the tank to get rid of the badges and poke holes in the exhaust to get a bit of note. Heck, get an old Ducati seat so that justifies sticking a Ducati sticker on it!
If you could do some research on what other people have done that solves the sorts of problems you have and .pdf / link that would be handy. I will be out riding my Ducati this w/e (to Bendemeer via Oxley

) so don't have time for it!
Regardless, there are many steps to get you back on a bike. The correct attitude, a happening plan for fitness / capacity, and getting something that is a suitable base bike to work with are the first three main bits. Over to you on these ones as they're all yours!

But do check about the base bike - I am suspecting a 250cc is about right for an initial attempt, like a 250 Virago might be a great starter - we can lose the tuning forks.... If it works out, we take the lessons learned to something bigger, or not if it is already a big win. Those little V's are not slouches; one rode with us in 2003 and had no trouble mixing it with the big Dukes, quite surprising really...
You need to be deadly serious and REALLY put in the work - to the point of results, not just 'try harder'. It wasn't easy for Bethany (in your video link) but she got there - it's a fair fight (you against you), are you up for it?