If you like the fit of the regimental kilt you sound like you find the fit to be important.
Buying off the rack from Stillwater and such and getting acrylic seems quite the step down. As others have said, you might be happy with PV. I agree, it's the closest material in a slightly lighter weight, machine or hand washable, Teflon coated for stains and holds the pleats quite well. The cost is way down from wool per meter.

But I think it may be just as important to get it made for you not just a general size to fit many. If fit is a big thing get it custom made, you'll enjoy all the benefits you are going for in a kilt. We have a number of quality kilt makers here that will make you a kilt for you, not off the rack.

Try MacHummel (Peter) at Canadian Casual Kilts for a custom made kilt, he can quote you for MM PV, MM wool, Loccarron wool and many alternative fabric like canvas duck and Denim in 5yrd, 6 yrd and 8-9 yrd.

Kilted Stuart