I think Stan's comment is the most applicable to this issue. When you are roadracing there is usually a crew just feet away from the likely places you will spill. At Bonneville help could be minutes away. With that in mind you want things as safe as possible. I agree with you on the armor issue too, but the fire issue is probably the biggest concern at Bonneville, especially with the heavily modified bikes. I was doing a similar inquiry about boots because so many of the quality race boots have perforations and non-leather parts. I don't want to make an assumption with a $300 item, especially hundreds of miles from a supplier. Z-Custom and a few others offer suits starting around $900. There are also some drag race suppliers that have all leather suits that are cheaper. There is a lady here in Arkansas who does repairs on leathers and she can sew panels in to cover the fabric and perforated areas. Let me know if you need her name. Good luck. I don't know that we will ever get rules changed that could decrease safety.
Ed