Hey Shboom,
Using cool old Korg keys is only commendable and just as common as using any other vintage synth.
I still own an O1/W and the buttons on that are okay. For now.

In your case you’re better off replacing the buttons with the buttons by some other manufacturer. It has been done and it doesn’t cost as much as replacing the buttons with the toggle switch (which for some models can mean a major surgery).
I’ve seen several posts on this issue at Yahoo O1/W Users forum. . I can’t recall the details of the process so you’re better off posting a question or doing a search in either O1/W or M/T Korg Yahoo forums.

Good luck.

-ED-