As long as "period" materials are used,ie,leather,matching examples of woven straping,ect..,you should be O.K. And since there ARE NOT a lot of examples left,how can the H/C-P/C police argue?
I've had upholstery webbing pass"muster" at various Voyager event's,some rather strick,to the point of some trigger guard's were questioned! I folded the edges over and sewed it even with the dark blue stripe that run's the length of the material. You can NEVER go wrong with a leather strap.