Sounds like the deformity has progressed since the injury, so I'd be real wary of the deformity worsening (and becoming more and more fixed in increasingly nonfunctional position) since the ankle dorsiflexors and everters are clearly being overpowered.
Based on the info available, I'd probably offer him either more PT and bracing or an ankle desis (probably anterior approach lock plate since lateral soft tissue envelope sucks and it's almost surely too malaligned for scope desis... although you could consent for both scope/open if you think a lot of your scope skills and have good assistance in the case). You could put it in 5deg+ of valgus to offset the limited STJ ROM. He obviously has to know that he'll need a rocker sole shoe to protect his knee and his hindfoot will likely need conversion to a pantalar - or at minimum agressive bracing - down the line too. And since he's somewhat insensate and with compromised soft tissue envelope + progressive imbalances, I'd flat out tell him that he's at very high risk for eventual ulcer or surg leading to infection leading to a BKA at a relatively young age. Yes, I guess I'm Dr. Doom, but that is the fact of the matter here.
The soft tissue corrections like Bridle procedure or similar superhero procedures are going to (not possibly... definitely) need revision down the line, and I wouldn't want to really mess around in all that scarred graft skin. A lot of stuff looks good on the drawing board, but this is a young guy with fairly high demand here. His ankle joint motion as it is sucks and isn't too functional (even if the joint itself is fine, it's clearly locked up from muscle imbalance and skin contractures).
Then again, he's has a lot of surg already, so it'd be easy to talk him into (and a lot of surgeons might) putzing around with gastroc recession, PT transfer, sTJ and ankle capsulotomies, skin plasties, etc etc with much physical therapy and bracing before eventually moving to the ankle +/- rearfoot arthrodesis. No real right or wrong I guess, but it's not my style to tell a revision revision case that's had a severe injury that everything will turn out kittens and rainbows. Every bone/tendon surgical procedure has its own physical/financial/emotional cost and its own convalescence period where he will undergo more and more cast dz of muscle wasting, contracture, and osteopenia.. and risk for osteo/amp etc. JMO
Real cool case... definite food for thought.