The clutchmasters kits from CFM in the states are decent kits to have but if you are after a Uk version you can get lite steel fly, sprung 6 paddle clutch, slave and plate for £1000 from Helix or you can get a lite steel fly, sprung clutch plate and slave from TTV for £600.
You cant just change the fly as your losing the "sprung" element of the duel mass fly so you have to replace the lot this time with a sprung clutch.