You might consider going chain guard, 39, 24 on your current crank. Ramp pins are available on t.a. brand chain rings in that size last i looked. If your cassette starts at 11 teeth a 39 is plenty tall for the big ring. You can even make your current 52 into a chaingaurd by grinding off the teeth on a belt sander.
Last edited by 52telecaster; 06-30-20 at 09:38 PM.