One of the problems I'm trying to solve is the messy canister oil filters. They are difficult to change, and every one I've tried (so far) has leaked oil. The best option seems to be switching to a standard spin-on filter.
The first solution, and probably the best, is to find a new casting that changes the mounting & mating surface. These have been designed and sold by individuals on the AlfaBB, but I could not track one down!
Alfaholics offers a remote oil filter kit that looks interesting. But there is no obvious place for mounting it and I'm not crazy about running the lines, etc.
The final option is to use an adapter from Flexolite (https://www.flexolite.co.uk/cat.asp?cID=4&page=OIL_FILTER_ADAPTORS). This is a machined piece that fits the oil canister flange and allows you to use a spin-on filter.
The Flexolite Alfa Romeo kit is relatively cheap, so I ordered one...