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Learning to touch type all over again isn't even that bad. Just takes a month or two
But what about the decades of muscle memory? >


But what about the decades of muscle memory?

It's fine. It's not like learning to touch type all over again.  It's essentially 9 keys arranged in a 3x3 grid with three other keys that most people use. It actually took me around a week to get muscle memory for it.  It took a little longer to get the + - and * keys back, but now I can use it with either hand, and having it on the left means I can use the mouse at the same time.