I forced myself to touch-type QWERTY in the mid 90s, and got quite proficient after a couple of years. Sometime around 2008 I decided to switch to Dvorak, and spent about five agonizing years (really) trying to get my speed back. I'm unable to touch a QWERTY keyboard now. :(

Funnily I've never made much of an effort to touch-type the numbers, it just seems relatively easy to pick up as needed (they are all nicely arranged in order, after all). As long as you can hit the `1` key and the `0` key, the rest is intuitive linear interpolation. I type the `2` key with my ring finger, that's just what comes completely naturally.

Best wishes.