OK, so today I've received my 3-Point yellow harness for seat removal and test install.
Option 1 > Install with straps coming around sides of factory seats
Option 2 > Cut hole(s) and install plastic inserts to allow through-flow of harnesses
Option 3 > Remove factory seats and install purpose aftermarket buckets (trying to avoid due to liking the aesthetic/electrics/comfort of factory seats)
Think I like the vibe of yellow harness over and above paying for the seats belts to be removed and replaced in yellow. Incidentally the cost of both options is near-on identical.
(Not to many owner tastes, I fully appreciate).