Your 2nd photo - is the feathering hiding the "other" toe?
If you do surgery, trim the feathers away.
Is there a web of flesh between them where the yellow line is?
Seems risky ~ If it were mine I wouldn't cut it but that's just me.
Does it perch well?
Is the green toenail material? I can't...
-definitely subscribing to see your photo/photos-
If it is the way I imagine, two toes joining at the end to share a toenail, then I would think dangerous to cut.
Maybe if you had that styptic powder ... but I imagine that to be a mess -- and a bird that size losing blood would be bad news...