It is not a minor annoyance. It is a major design SNAFU that people have been complaining about for two decades now. Idiots! It is a little bit better on the digitals. At least you don't have to memorize custom function numbers and settings. But still...

But for your case, sine this lens will be the only reason you have the body, you can just leave it set on mirror lockup mode most of the time. Make a note on a piece of tape about the custom function number and setting, and stick it to the camera for the times you want to shoot it without MLU.