My personal theory is that yes, a homozygous spider is possible and worth proving out. No I dont think two straight up spiders could do it. We've seen so many failed clutches and slugs from Spider x Spider. Maybe we just need to add another X gene to the mix that will create the spiders homozygous form without linking it to the nervous system(or at least making it not quite so bad)
I plan on breeding spiders, but I want that to be on the back burner. My other prjects wil involve spider genes, and if we keep adding new and different patterns and genetic information, eventually it may be able to hatch out.
I could be completely wrong, but at the very least this is what I would like to believe.