904 Valve body decision

I’ve dug through some other posts about this and some have kind of an open ended answer. I’m going to using a B&M promatic 2 instead of the column shift and I’m wanting a manual valve body, so I’ll be going with a TransGo tf 3 kit to use in my current valve body while I save up for a trans rebuild and full manual valve body . I don’t want to deal with a TV cable and I know I can just tie the lever back fully and that’ll keep the pressure high all the time. For a weekend cruiser, at this time, should I be worried about the high pressure or will I be alright? This is if my car will be driving before the end of fall.
If you tie the lever all the way back on an auto valve body, it won't shift until high rpm.