Pinky
and The Brain...
This is why so many of us have nice home/car stereos to back up our guess work...
We would (should) be doing this anyway (that isn't the question here). Shifting mixes to/from other playback sources is tedious and never exacting (or a desirable means to an end). If this needs to be done a lot, then IMO the monitoring setup needs improvement/isn't any better than the 'other' supposedly inferior playback sources that the mixes are being run through. I rarely make changes anymore based on playback outside the music room. I still do it, just to be sure, but it's not the primary tool to accomplishing the mix.
I was once a fan of using compromised gear and getting the most I could. Then as I learned more it became apparent that certain things could be compromised, others could not. Quality mixing headphones and monitors cannot be easily substituted.