Hmm... the least tricky way to play Fmaj7 for me is the barré chord 5557. It's also a nice voicing.
The closest thing I can think of for an open chord is 2410. Not so comfortable, though. I use my pinky for that E-note at the fourth fret, but it'd take me plenty of practice to get comfortable switching to and from this position. Easier for me to finger an open F chord 2010 then add my pinky for 2410.
Have fun.