I've converted two fullsize M's to SSK's. While folding the membrane is an option, I cut it and used a combination of thin copper wire (out of cat-5 cabling), and foil hvac tape (WAY cheaper than copper tape) to reconnect the jumps.
Has been holding together with no issues for almost 5 years now. I have a real SSK and an ISSK but I like my frankenSSK and it's been my daily driver for the majority of that time.