Rimmerbros sell an ace removal kit. It can still be expensive but includes everything you need. You can cover some of the cost by selling on the parts you remove if thats what you opt for. Sourcing parts separately will be a lot cheaper, getting standard anti roll bars from a breaker for example. If you fit an idler pulley in place of the ace pump I beleive you still use the same belt as this is what a mate of mine has but there may be different arrangements available. If you fit the idler you will get alarms coming up for ACE system fault until you get ecu re-programmed. As said before, if you dont fit idler, make sure you keep fluid reservoir topped up. Othewise.....doomsday scenario which has happened to folks, your pump will seize, serp belt snaps, and if you manage to keep going like this you cook the engine along with any other resultant damage. Sounds a bit OTT I know but point is to keep a good eye on it and id avoid long journeys until you sort it.