I'm in a similar predicament...
Talking just RF (since I sold all of my EF & EF-S glass prior to converting)...
Had & sold the R w/ the 24-105 f4 kit (sold both mainly because it was easier to sell the kit CIB). Kept the 50 f1.2 & 70-200 f2.8. Got the R5 + 100-500 f4.5-7.1. Love all 3 of the lenses I currently have and no regrets on any of them.
My goal was to fit the R5 w/ an awesome lens for the 'mid' range (replacing the 24-105). Got the 28-70 f2 (I mean why not, I have IBIS now). But the size/weight was not what I expected... I needed that lens as at least something I can somewhat carry around for periods of time... which the f2 is not (at least for me). So that went back...
Actually, this made me want to skip the whole f2 range and go with a 35 & 85 f1.2 at some point... but not rushing for those before I fill more of my kit. Thought process is if I 'need' f2, would I rather have access to 1.2 instead? (I know the 35 is a rumor still, but it's last on my list.)
So now I'm debating getting the 24-70 f2.8 or the 24-105 f4 again to fill in that range for the walk around... but this topic had me thinking of an alternative.
Should I get the 15-35 f2.8 instead of the 24-70 f2.8 or 24-105 f4 to fill my wide range first... relying on my 50 f1.2 to fill the small gap between 35-70? And if I really need, wait till Black Friday sales hoping for a deal on the 24-105 f4 for the walkaround mid range (that's lens has to be due for a good sale). Or keep the 24-105 f4 as a distant memory... instead filling out the kit w/ the 24-70 f2.8 (better f-stop but smaller range) at some point in time? I could probably get away with the 24-105 f4 (for the size/weight/range) with the 50 f1.2 as the low light/nice bokeh backup. The thing that has me doubting the 50 is I really like a zoom more often than not for any focal range (I'm never standing still and foot-zoom sometimes isn't practical)... so I currently only grab the 50 if I know I need it.
Ug, the choices... and dang be that GAS.
But (back on topic)... if I already had the 24-70 f2.8 on hand, I don't know that I would part with it (since you don't have a fast 50 yet). However if it's a matter of choosing 1 lens or another... than only you can make that call.
Back when I had the 24-105 & 70-200, I can say there were times I went light and took one or the other. If I had no idea what to expect, I took the 24-105. If I knew I wasn't going to take any close portraits (limited space) than the 70-200 went. If I knew the lighting wasn't going to be the best, I would go for the 70-200. However towards the end, my 70-200 got more on-camera time.