The steering controls harness looks fairly long in this teardown, but I can see how it could be tight after adding 2.5" and considering that you need room to actually fit your fingers in there to plug it in.
https://youtu.be/CGjLhYY2Q_Q?t=279
Still, the fact that it's "only" steering wheel controls gives me some confidence. I wouldn't mind splicing some extensions on a radio wiring harness, but much less likely to muck around with air bag circuitry.