How is the loader hydraulics hooked to the tractor?
Pictures of the hookups on the tractor and loader would help for members to give advice. The Massey hydraulics are unique compared to other brands.
I just looked at agcopartsbooks and saw that the 245 may have an auxiliary hydraulics separate from the three point. I was thinking it was similar to the 100 series tractors. This will change things but there are possibilities.
I am assuming that you have a two spool valve mounted under a shield feeding two sets of remotes. One set for the loader lift and the other for tip and rollback.
did some more looking at agcoparts books and see there is a hydraulic manifold between the valve and the tractor. There may be some sort of divirter valve available that allows addition of line to feed another valve strictly for the loader and allows use of both or your standard rear remotes. google dirvirter valve for 245 Massey and see what you get.
The other possibility is to use one set of remotes to feed a new two spool valve to run the loader. The lever feeding the new valve will have to be pulled back and held to supply oil to the new valve. The return from the new valve will go back to the other side of the remote feeding the new valve or directly to tank. You will then have the other present set of remotes freed up to use on implements.