[stephen low]

At $2500 it sounds like a bit of a take to me.

Even if you don't like MX5 seats surely retrimmed seats from another car would suffice at a fraction of that cost.

Perhaps the old make it work for engineering then change to what you want post engineering is the go.

Then you could ignore ADR requirements later ie but some old MG or similar sport car seats. This would achieve the low back, low seating goals.