Here is something you could consider:
Let's pretend your Bronica/Yashica Mat is a special LF camera, giving you superb quality without the hassle. We don't know how large prints you make, but unless you're absolutely sure you want a decent contact print or movements, MF can produce solid quality in a much more compact form. Yes, a print from a 6x6 negative, using the finest grained films (as you do from what I saw in your excellent Gallery uploads) will not look exactly the same as one from a 5x4 negative, but the difference can be so small as to become irrelevant. If you managed to get your shot with the LF camera.
Looking at my own photographs, if even I don't care that much after some time what format was used for a given print, I wonder how much others will. It's easy to see the difference in an A/B test of course, but by looking at the print from the smaller format alone, the chances are high you'll think "now this is lively tonaily/next time I should open up the aperture more/use an orange filter", instead of "damn, why couldn't I take this using my LF outfit?".
Use any camera (more or less) long enough and it will become intuitive and easy to handle regardless of the situation. It's all in the photographers mind:
1. If you can trick yourself into thinking that you're actually not shooting Efke 25/TMX/Delta 100/Acros/Pan F+ in a 6x6 camera, but a well-maintained 5x4 with a clean lens, you win on many fronts and lose only on a few.
2. In 1905 someone was happy if he could borrow a friend's camera, very happy if he had his own and was loosing his sense of reality if he had many lenses/cameras to choose for a given shot. Pretend it's 1905 and you're lucky to have a great camera with a single lens. Choose one, put away the rest and don't think about them for a month/year.