I personally think that's a really good plan. My view of BTC as an investment, which may be proven utterly wrong of course, is that it will crash in value periodically and gain even more value in long cycles, like Coca Cola stock once did.

I'm a little reluctant to start such a plan right now while BTC is (apparently) peaking...but I'm just guessing like everyone else. I wish I had been doing what you are doing for a few years.