Pull the seat forward, and undo the steering wheel adjuster and push the steering wheel into the dashboard.
The memory foam squashes down to around 1”
But I find I don’t lose my backside into the seat.
Get one from Amazon and if you don’t get on with it in 29 days, send it back for a full refund.
It’s reduced at the moment as well.
From 30 to 24. Bargain.
I have one to take on flights every week as I’m sick of bruised elbows and backache.
Works perfect for me.
Not going to say it will work perfect for you.
But worth a punt.
bonmedico Memory Foam Seat Cushion - Non-Slip, Raiser Wedge Cushion for Office Chairs to Support Standing - Portable Car Seat Cushion w/Handle for Lower Back Support - Gifts for Women, Men & Elderly
https://www.amazon.co.uk/dp/B06XKD4K4Y?tag=eliteelect-21