Can it be done? Yes it can, should it? Well some would debate that.
Yes lock them up and settle them in. Feed call them and trap train and they will be okay.
Do you already have Homers?
Many would say that if a Homer has gone 60 days without flying it is too late and will effect it's ability.
If they have never been out at their old loft they will train just fine at yours.
As far as a Homer going 60 days without flying affecting their ability? What?
My Dad races Homers. They have a young bird season and an old bird season. They break between the 2 for a couple of months, not saying they don't get out to fly around the loft at all, just not train intensely.
You can get a Homer in condition no matter how many" days it has not flown"
edited to add that they get out of the loft to fly around outside- not in the loft. LOL!
Non flown young birds will settle into your loft as readily as pigeons that you raise yourself. Use a settling cage and appropriate 'settling' methods and they will be fine.
60 days without flight affecting flying ability? More on this please.