My penchant for RUD algs reminded me of a finger-trick I've adopted that I don't think I've seen anywhere before. The one exception to flowing RUD algs for me is whenever there is a D2, I've never come up with a serviceable double-flick for D2. I've avoided algs with D2s where possible but still have a couple in my Ab alg, which I now execute with my left ring finger reaching across the back face to RBD and doing the U2 in one single motion, starting with the RBD corner in the crease of my ring finger's first knuckle and ending with my ring finger flat, fingernail side against the bottom of the L face and pointing at me.
It's a bit of a reach, which induces a delay, but easily beats all my attempts at double-flicks thus far. Obviously mirrors to the right ring finger reaching to LBD, I just use left for Ab because of how the grip works out. Also no reason it couldn't be done with index finger for U2 but I've never really employed it there. Counting the reach delay it probably works out the same as my double-flick U2 though the actual movement, once started that way, is a little quicker for me.