Learn how? Almost definitely.

Actually do it? That's a lot less certain than you would expect.

I would probably start. Since this hypothetical is a pretty simple one-off, I might even manage to generate enough executive functioning to follow through.

What I can tell you for certain is that I am still very excited to work on a custom keyboard project that I started 4 years ago. I have all the parts and equipment readily available at home, and plenty of free time. I have not worked on it at all over the past 4 years.