I have one razor that's open comb (Gillette Old) and one that is a Bakelite kinda copy of a Gillette Tech that has a comb with the teeth connected along the bottom. Haven't shaved with the Old yet. The Bakelite razor shaves really well with a sharp blade. It's very mild. All my other DEs are safety bar types.
I don't have a strong preference either way.
Go ahead and shave your head. Damn what your wife thinks. Sometimes ya gotta remind the hen who the rooster is.

:foot:
My wife doesn't like me shaving my head, but it's more comfortable and convenient. If I get dirt or grease in my hair at work, it's a pain to get it out of my blond hair.
If I get it on my shaven scalp, it's a simple wash job.
Right now isn't the best time to start shaving a noggin. That summer sun is brutal until you get a little sun on that tater.
Seriously though, what kind of open comb razor did you get? I hear that a lot of them are super aggressive.
I'd like to try a slant bar razor. I could do 2 passes instead of 3 and get the same results.