Your plan makes no sense to me. Replacement chainrings are not cheap.

If you need the low gearing that a compact offers, get the 50/34. It makes the most sense and that is why the 50/36 is not offered. If you don't need the additional low gearing, get a 53/39.

As an example, a 50/36 with an 11-23 is basically the same as a 53/39 with a 12-25.