What I'm thinking will work, is I buy the Trans-dapt kit like Wild One suggested. Get a local hydraulic hose mob to crimp me some 90deg or maybe 45deg swivel ends onto 5/8" hose, and screw some 5/8" M-M fittings into the Trans-dapt engine end piece for the swivel bends to bolt to.
Then make up a bracket for the Trans-dapt dual filter housing, with straight 5/8" hose nipples on it. Cut the hoses to length to go onto the nipples and put hose clamps on them.
Order of build should be:
Make up an adapter bracket for the filter housing whilst the car is how it is now, fabricate it, paint it and bolt the housing in place with the nipples on it.
Remove the oil filter.
Clean up all the oil.
Screw the engine end in place with adapters attached.
Screw hoses with crimped swivel ends onto adapters.
Cut hoses to go onto nipples and hose clamp.
I could make it neater and use proper hose ends too at the filter housing end.