Swapping Keycaps on Freewrite Devices : Alpha & Smart Typewriter

I've been wanting to try swapping and customizing the keycaps on my Freewrite devices. The Alpha has a flush keyboard and even though I'm happier with it than I thought I would be and it is pretty comfortable. I'd like to change the keycaps to see if my spelling improves. I have a set of the Smart Typewriter keycaps I had bought to swap my white keycaps for black. Freewrite released the "Ink" edition after and after buying that device I didn't feel the need to change the color of the keys any longer. I don't think they will fit the Alpha but I thought I would give it a try. I love seeing how others have customized their Smart Typewriters with different style keys and colors. Sometimes it's just a few keys swapped out.
How have you customized your Freewrite or other writing device?