Thanks everyone for your feedback. After looking at your collective advice I have decided to get SCART cables for my SNES, Sega Genesis, and Saturn on ebay from retro_console_accessories. I decided it was worth the investment so I don't have to hack up any more systems. The SNES I added jacks to was a project SNES anyway with a bad power port, so no real harm done anyway, it was my first time seeing RGB from a retro console so it sold me on the concept

. I do have a SNES mini that was modded by someone else for S-Video, I don't know if that means that it is RGB ready or not (any thoughts?).
I decided to pick up a SyncStrike as well because I could only find SNES and Saturn SCART cables with sync on composite from retro_console_accessories. (there was a sync on luma option for the SNES but I'm not sure how I would easily hook that up to my gbs-8200, and I didn't see that option for the saturn). The Genesis had a boosted CSync option but it seemed to make sense to keep things consistent with composite on sync. With the SyncStrike I can use the same type of cable for all three systems. It seems like Sync on Composite SCART cables are easier to find, and I hope to eventually get cables for my other systems (TG-16 CD, Jaguar etc.). I also like that it has audio output jacks from the SCART connector and I wanted to be able to use gbs-8200 and T-SLG v1.6 - Main scanline generator that I already have.