Is it possible to change the seat on the Baffin kayak to a full Flex 4 seat with adjustable seat back?

Is it possible to change the seat on the Baffin kayak to a full Flex 4 seat with adjustable seat back?

Yes you can replace the seat back to make it a full Flex 4 seat .

You will need:
Seat Back:
https://boutiqueborealdesign.com/products/flex-backrest-thermo-kit-2

Backrest Cover:
https://boutiqueborealdesign.com/products/flex-backrest-cover-a

Thigh Brace system for Flex 4 (because this is where on the right side of the thigh brace there is the adjustment cord for the seat back adjustment)
https://boutiqueborealdesign.com/products/thighbraces-for-flex-system

Knee Pads (optional) depending on configuration of your old thigh braces will need to remove and possibly the padding too:
https://boutiqueborealdesign.com/products/beluga-self-adhesive-rectangular-knee-pads

hope this helps,