there's a site dedicated to doing something like these:
Comfort Basics
lots of info to get u thinking and tinkering - spent some time to mod the seat to your liking - no one else can spend the hours to mod your seats, let u test for hours, then reshape - this process is labourous.
Once everything is finished, put a thin covering foam on - hides on the imperfection when u recover the seat. If the shape changes too much, u will still need to get someone to sew a new cover - at least u know u got a personalised seat which only fits u
What mine looks like half way through:
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i didnt take any pic when i finish the remolding, but this is the final result after professional recovering:
Comfort Basics
lots of info to get u thinking and tinkering - spent some time to mod the seat to your liking - no one else can spend the hours to mod your seats, let u test for hours, then reshape - this process is labourous.
Once everything is finished, put a thin covering foam on - hides on the imperfection when u recover the seat. If the shape changes too much, u will still need to get someone to sew a new cover - at least u know u got a personalised seat which only fits u
What mine looks like half way through:

----
i didnt take any pic when i finish the remolding, but this is the final result after professional recovering:
