Not a lot of info to work with such as the environment, your career field, etc. but in general I would say don't over think it.
The "no sharpening for a year" but moderate to heavy use isn't very realistic.
I spent a bunch of time in the field with a Buck 425 secured to my belt loop with about 18" of gutted 550 cord, a good Leatherman, and my M9 bayonet. The M9 is more of a pry bar, hole dig, etc. kind of thing. The little 425 and the Leatherman handle all the general purpose cutting stuff. I don't know if you're in the US military, if you get a bayonet issued or if M9's are even still the issued bayonet but they do have a tiny little stone on the backside of the sheath. You could do the 425 and multi-tool on it but you have to use scrubbing type strokes and it's pretty crude.
A DMT course or even extra course DiaFold would go a long way here. Compact and lightweight but would be quite effective. Watch some videos, use a marker to mark the edge bevel and do some practicing. You'll get it and then the sharpening thing will not be a restriction.
Abuse the issued gear and be mindful of your own. If there is an issued tool available for a task, use it. My longest deployment was 7mo's in a desert environment and I carried the above. I didn't have the DiaFold but sure wish I would've. I got by with the little M9 stone but "got by" is about as far as I'd go with that. That little stone is not up to doing anything much with the bayonet itself.