Advice for hard Gemini patterns?

[dumpworth]

Songs like Eeliaas, Igallta, Better Graphic Animation, where you have to alternate between Gemini and single notes repeatedly. Note streams are no problem, but as soon as I have to do any quick Gemini patterns my hands just get confused. Something about alternating between fingers and Gemini pattern just throws everything off. The patterns are easy to read, but the alternating input is very confusing.

I see some people use different button layout but I just use DF JK for high low.

EDIT: For anyone else who might be struggling with the same thing, I have found a pretty efficient way to practice. You can practice the patterns in slow-motion by watching someone play the track on youtube and skipping to the pattern you want to practice. So you can practice on 0.5x, 0.75x, and eventually 1x speed without having to replay the entire song.

[Marshmallow]

Either have an up key and a down key grouped on the opposite sides so you can use one hand to hit Geminis while the other hand hits the singles or practice getting used to hitting the second key immediately after hitting the doubles.

Or if you really don't care about accuracy just keep pressing both keys as if they're all Gemini enemies.