I've never been able to use any kind of fingerpick or thumbpick very well, and can't offer any expertise about it. Alaska picks aren't secure for frailing or down-strokes, because they rely on bracing under your nail, but you might try taping one closed and see if it holds that way.
For several years now I've been making a different kind of thumbpick and fingerpick--they aren't on the market yet, and this isn't an ad. The pick element is folded to a peak alongside, sort of parallel against the side of the tip of the digit, so you still touch the strings, and there's an up- and down-stroke. It sounds like it would impede the other fingers but it's a very thin material that becomes strong enough because of the creased structure. If anyone is curious you can look up my patent at the www.uspto.gov site, under issued patents, simple search, with the keywords musical instrument picks. A handy person can make them with a jar of peanut butter, needlenose pliers, and scissors. But don't bother with the clasp in the drawings--auto chrome blackout tape is a good tape to fit them, and scotch tape will work, but is ugly. To see patent drawings you need the alternatiff plug-in, but the pto refers you where to get it.
Apart from my picks, it's not a bad thing to be familiar with, and would be a good thing for h.s. kids to nose around in. Many people have mythy notions about patents as get-rich schemes. I wrote my patent because, after searching, they were so novel one would have to be a poor sport not to try to do it. And maybe enough people will like them enough to make a little hobby or business out of it, it's hard to say, just yet. Fred