one thing i'd want to change would be to make the seat belts come out thru the spots on the side of each seat instead of their original location... not sure what all that would involve though.
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OEM Parts man here, those seatbelts from the late model & all the electronics needed to make them work properly is;
1) An unbelievably large headache
2) In the range of thousands to tens of thousands of dollars
For starters the pretensioner probably only talks to the SRS unit on the 2018 (or similar), so you'd have to essentially move over an SRS unit from a newer truck and rig it all up.
An SRS unit can be anywhere from $500-$2000 depending on which make/model and what kind of markups your dealer works with.
Generally an OEM seatbelt w/pretensioner is between $200-800, matching buckle usually $150-300, and you usually need a pretty expensive computer to reset/set/program most things in a SRS.
Its probably way easier and more cost effective to try to rig some kind of race harness to fit the actual seat's seatbelt cutouts.
Would be pretty cool - but most likely more trouble than its worth.