I actually have a Strikes and Spares and ran into the exact same issue as you with the LEDs. I didn't want the expense and hassle of swapping the lamp driver board so I put LEDs in the GI and put #47s everywhere else, which don't generate a lot of heat. The combo works great.
Incidentally, I experimented with several kinds of LEDs to find out what would look best. I use mostly Cointaker warm white frosted in the playfield GI, with a few warm white "retros" in places where the lamps were visible (like under the clear plastic by the kickout hole). This combination looks really nice to my eyes. I also used warm white super brights in the backbox.