agreed - I'm tied to cans as well and can't even use 'moderate' volumes due to time restrictions.
So I'm trying to match the sound image against reference mixes from records I consider (really) well done.
One can get pretty far this way, but it's still very(!) different from the open soundfield.
Impossible without cross-checking... and adjusting. That way the monitors would save time, no doubt.
cheers, Tom