Fearing the shields, I held off any mods for a long time. Finally did a 500MHz this morning on my 3000T and couldn't be happier. 605MHz BW (0.707) and 750MHz (50%). Triggers beautifully everywhere but response hits a brick wall just a hair above 1GHz on this mod.
But regarding shield removal, it was a piece of cake. I used a Pace medium/large chisel and Chemtronics Soder-Wick of the Rosin type. Solder wicked away easily and the pads cleaned up like new.
Did the component removal with hot air and, against my better judgement, with no bottom heat. This does take a bit longer when an attached via ties to a plane but still not bad. This was with a Quick 861DW hot air station, my new favorite. Super low air velocity is a plus for this tool. It made my old Pace ThermoJet look like a toy in comparison to the wattage it delivers to the air.
With irons, the biggest shortcoming in SMT removal is inadequate heat and too small a tip, which cannot transfer the heat adequately. Especially with the higher melting point of unleaded solder.
TheSteve had a good idea with his "undo" kit of parts. He used separate bags. Being somewhat lazy, I used double sided tape stuck to a card. Parts are laid on the tape by channel and rough arrangement. I let the parts cool first so they wouldn't get permanently "glued" to the card.