Yes! I drove truck for years and years. The seats are/were an ongoing BIG problem

For you the answer is simple. Put a good cushion on the seat. Go get some carpet underlayment and glue together several layers into a shape you can stand and use. The foam underlayment is about 3/4" thick. It is strong enough that it won't scrunch down like the cheep crap cushions sold in stores. You can layer it up as thick as you please and contour it as you wish. Use a regular kitchen electric knife.

Have an auto upholsterer make a good cover for it. It will cost a few bucks. It will be worth it. It will last for years. It will take several days experimenting to get just what you want or need. Just keep at it. You can do this.

You can also rotate the seat forward or backward or up by putting shims under the seat legs. You can get another seat out of a wrecking yard - move it from car to car as you change cars. Use your ingenuity. Don't take any vehicle seat sitting down :-)

There are many other problems but this covers yours. Go for it!

One example:

At one period I used a thin back board made from panelling with a cushion glued to it as a back rest in the seats. I looped a sting around the seat backrest to hold it in place. That took out the terrible curve in the backrest in those million miler seats. Some curved both vertically and horizontally. Try sitting against that for 12 hours or 400 miles which ever came last.

My 03 Ranger Seat Mod

002 shows the seat as built with the hole.
004 Shows the under cushion that fills the hole
008 Shows the top cushion I fashioned from 3" thick carpet underlayment
Note it is flat and level and does not slant back and is contoured so it does not cut off circulation under my legs.
010 Shows the backrest with its wings and the forward slanting head "rest" and note the lumbar pad I fixt up.
014 Shows the cushion which keeps my head away from that head "rest"
002a Shows a cushion laid up from 3/4" layers as described above - lotta miles needs a new cover.

The under cushion and the back rest cushion are filed with cloth material so they keep their thick; NOT cheep foam that collapses.

The back rest cushion has a groove in the middle that my backbone fits into.

The top seat cushion is near 30 years old and shown is the 3rd or 4th cover which has been on for 5-7 years. That cushion must have 100's of thousnads of miles as I used it driving truck. The 3" thick carpet underlayment may no longer be available.

I have an injured neck and absolutely must have my neck straight. The forward tilting head stops are impossible for me. Hence my backrest cushion fix. Keeps my head away from that stupid head rest.

Well, Phoggie, there you have it. A complete illustrated help yourself story. Luck to ya.

Thank you for your suggestions. I do have some foam that was used for upholstery that I could use, but when I use them in my present vehicle, the airbag light comes on, so I would like to be able to have them operating properly for safety sake. I also have had neck surgery and can not stand for my head to be tilted forward either.

I can't help with that but maybe a forum for your car type would have a workaround. Other people must use cushions. If it's a pressure switch might be easy to get around. If it's a momentum switch maybe not. A pressure switch can be converted to a manual flip switch...... the car computer wouldn't know the difference. On is on.