school me on racing seats (tendonitis prevention)

I'm autocrossing an ND Miata in STR AST class. It has all the usual class mods and routinely pulls 1.2g laterally on 200tw tires. The car currently has stock (non-Recaro) seats with a Aurora lowering bracket (without it, I can't put the top up with a helmet on).

I'm dealing with significant tendonitis in both elbows, presumably from bracing myself into position during cornering. (I also end up with bruising on both knees from bracing myself against the door and center console, though this is less of a concern). I just saw an ortho yesterday and have started oral steroids and PT exercises to try to deal with it. Our season begins soon. I'm planning to do a lot of autocross in 2025 and don't want to keep aggravating my injury.

I suspect that the long-term solution is to install a racing seat and harness to hold me securely in position. I really don't want to do this because:

• it's money I'd rather not spend
• another step down the slippery slope to race car
• though the car is primarily for autocross, I do street drive it some
• my wife and teenage children occasionally like to drive the car
• this season, I'll be driving the car to events which are 4+ hours away
• i frequently have co-drivers in my car for events

I'd love to get input from this community on the pros and cons of racing seats. I don't know anything about them - I've never even sat in one. At minimum I'd need the seat to be adjustable fore and aft to accommodate different drivers. Alternatively, is there some other option worth considering? (Like maybe looking for the optional Recaro seats?)

I'm 6' 0", about 190 lbs.