If you want the top of the remote to be flush with the block, aim for the sum of your stock heights to be about 24mm (1inch).
Estimated time: 1 minutes
There are two profiles to save time/waste. You could cut this out of one solid piece, but you're going to make a lot of dust. If you use similar materials/settings, expect to cut both parts in about 30-45 minutes.
Estimated time: 45 minutes
Originally I was going to secure the profiles with some glue + dowels, but I got lazy. There's a decent chance tomorrow the dog will have eaten both the new remote and the holder anyway. So I just sparingly used a little bit of clear gorilla glue, then clamped, waited and sanded everything.