Hi, I have a 1991 Reg White and have rigged the double trapeze with no problems, so that shouldn't be an issue. I haven't done the conversion for spi, so I can't help you there. After owning the boat for a while, I think I've decided that for casual local lake sailing, it's not worth the extra cost, and especially the extra rigging time/hassle. I can attest to the fact that the boat is a huge amount of fun w/out the spi. I doubt you'll be disappointed either way.
My 2 cents.
Al