The standard Gimore pickup is the Duncan SSL-5, which is a hot single.
A Blue Velvet may work for both, anyway, considering your amp.
Trower often uses a Fuzz Face type device between the strat and the amp. This approach lets you control the tone more with your guitar volume when using low output pickups. Cranked up it drives the fuzz face which in turn drives the amp harder, and backed off it cleans up. Trower for many years used a JCM 800. Now he uses a Vintage/Modern. With a Soldano you should not need either a fuzz or a loud pickup, just set your gain in a spot that allows you to clean up or push it.
You may want a noisless set with the high gain amp, though.
