Looking for a beard trimming razor. What should I look for?

Hi everyone.

I've used quite a few razors, mostly straight razors but a few years back (maybe five or eight) I got a couple safety razors just for the convenience of not having to strop and sharpen so frequently. I have a very wiry beard. Anyway, my daily tends to be a Gillette Fatboy which I love for many reasons that I'm sure you all already know.

Anyway, enough background. I have a full beard, which I trim and edge with the Fatboy. What I'd like to find is a safety razor with an edge guard that I could use to trim my beard itself to around 1/2 - 5/8" or so long. To make it look more even. I'm imagining it like the Fatboy's adjustable but to a more extreme level. Or maybe just a guard that goes over a standard razor. Did this ever exist or did men use only scissors to trim their beards before the age of electric clippers?

I'm sorry if this is an obvious thing but I attempted to search and only found information on how to trim around your beard with a safety. I want to shorten, but not remove, the actual beard.

Thank you in advance!

P.S. - if I took the same double razors I use in my Fatboy that'd be even better.

Looking for a beard trimming razor. What should I look for?