Thought I would update this to say I received my picks the other day. After some experimenting, I found them to be very nice. I do need to order some larger ones though, as these are too tight to wear where I like them (just below the knuckle). I also needed to cut back the end of the strap a little because it was catching strings on up-sweeps and pinch harmonics.
I have no issues whatsoever with fast picking like I thought I might, because I can just hold the pick like normal. I'm even finding I can do this stuff without holding the pick, with my fingers relaxed comfortably over the higher strings. I am already developing a new playing style with this, which will involve a lot more string skipping and tapping. I love it
I highly recommend trying a thumb pick to anyone who is looking for something new to spice up their playing and inspire new styles.