Stihl MS261c Easy start swap to normal housing

[Fatboy2017]

I have a 2010 MS261c non Motronic, non decompressor model, fitted with an easy start system which contrary to a lot of views I'm ok with as I have a few Dolmar / Makita saws fitted with easy start system so used to them. However I bought this saw recently from a tool dealer who used it himself for a while. When I went to look at the saw he drop started it a few times which is the best way to damage them! Anyway I went through the saw to repair / service anything required and when I took the starter housing off the pull start bits fell out! The very end of the shaft which the easy tart bits are fitted has a circlip and this end piece of the shaft has broken off.  Question is, what is involved in replacing the easy start housing with a standard start housing? Is  it just  housing swap? is the flywheel the same?. A replacement easy start housing is a bit pricey, second-hand ones are not that common.