If it is a 10 AWG (or even 12 AWG), you should be OK with a 30 amp fuse. I will probably take a blast of crap saying 12 AWG is OK for 30 Amps, but consider that the wire basically rides along the car body as a massive heat sink. Also, cycling the top doesn't take all that long. So I think you are good to go.

I also would not put it past GM to yank the fuse and but a shorting link in place. Remember these circuits are only energized when the switch is actuated. Similar to your starter, it is also not fuse protected.