Sorry it has gotten to this point for you.
Good luck with the butterfly.
But you don't have to tear the whole reef down to get rid of aiptasia Unless the rock is just too heavy or all glued together to take out piece by piece.
We have a predominantly torch tank but it does have some other simple sps....montis, birdnest, digi....
We have a 220 and pull the rocks out weekly when we need to. Yes it's annoying but it was the only way to really control them while using shrimp and nudis.
The shrimp and nudis only eat the small soft new ones and butterflies and filefish as you know are hit and miss and eat coral
We lost a lot in meat corals trying a butterfly.
If possible I would try to take the rocks out and put them in tubs with tank water. Do this after a water change so you have the available water.
Go to town on the rock with really whatever you want to use to kill them.
Screw driver and tweezers work best for us.
And before you say you have too much stuff on the rocks here's a pic of our tank.
If things are glued to your rocks that's where the tub of water comes in handy.