This is different from your use case, but I recently became "bi-cameral" myself. Been switch-hitting for about 8 months.
I own a 1980's vintage Tamron Adaptall 300mm f/2.8 lens. For those unfamiliar, the Adaptall series of lenses were sold "mountless" and were purchased with whatever auxiliary mount was needed for your system (Canon, Nikon, Minolta, Olympus, whatever). I tried a couple of their lenses in the 80's and found them optically quite good, but the deal breaker was that they focused "backwards." At the time, I was a Nikon shooter. Since I am now a Canon shooter, it's no longer backwards to me, and when I saw a mint condition copy of this lens for about 700 bucks, I waffled for a few weeks, but finally bit on it.
Of course, it's a manual focus lens. But I'm old, so I can do that.
To make a long story slightly shorter, the so-so quality of the "fourth-party" lens adapter (Tamron never made one for EOS), plus the need to stop-down meter due to the Tamron's lack of electronic aperture, made the user experience a bit dicey. So finally, I broke down and bought a Nikon D7000 and Tamron Nikon AI Adaptall mount. Since even a relatively new Nikon "understood" the old non-electronic AI mount, stop-down metering is avoided, and there were none of the little electronic glitches I got with the no-name Canon adapter.
So, I effectively have a 450mm 2.8 and one body that never separate from each other. The unit has become quite a workhorse for me for basketball (a little tight, but got some good stuff), indoor track, golf and softball/baseball. Looking forward to soccer this fall.
Since I had a Nikon in my hands for the first time in over 20 years, I made myself take a good look at switching systems. Manual focus direction is a pretty big deal breaker, but even if I surmounted that somehow, I would second the motion that the menu system previously mentioned is torture to use. Since this d7000 is basically a single-use camera for me, I don't need to dig into the menus much, but when I do, well…I can't say it any better than "Gibbon on crack," so why try?
I won't brag on Canon's menus either, since they look like MS-DOS compared to present-day iOS or Android app menus, but Canon's mostly logical layout and the quick control dial at least make it usable.
A lot of people can reach a point when dipping into the "other" system is the best way to solve a problem. Obviously, RGF is an avid landscape shooter. I'm an avid sports shooter, as well as cheapskate, recycler, and old equipment nostalgist. If your personal passion leads you to consider "crossing the line," don't let brand loyalty stand in the way. I guarantee the brand isn't loyal to you.