Heat it and take it off... be carefull anyways because if you apply too much heat the lugs will be ovearheated (duh) and youl get something called crystalization (not so sure of the word ok?) in the lugs.
Once the Bass turned to liquid (or is softed) u have to pull the tube out. what U can do to play safe is to replace the lugs also (because of what I said before.) and since you are re doing half of the bike, replace the front also heheh after all u have to bass it again right?
My next solution is to bend the tubes again untill you get the bike right, and how the tubes have a dents for sure, put some brass in the dent and u are done (all depends of the damage anyways).
UM.