What I do know now (oh, how I love hindsight) is that I would never again specify spoked wheels. Look good they might but they are far too maintenance intensive for any car.
Agreed. Having had two cars with wire wheels, they never even made the “possibly” list when we specified our Plus Four.
Given the way in which wire wheels are fitted to a Plus Four, converting to alloy wheels may be straightforward. Two questions would need to be answered:
1) Are the wings exactly the same width for the 2 options (wire / alloy)?
2) If you remove the wire wheel adaptors, are you left with a hub to which an alloy wheel can just be bolted?
If both are yes, then a specialist alloy wheel firm will be able to advise re dimensions and help you choose some good looking alloys. Wheel Mania in Hinckley are one option (as per the Mat Armstrong videos).
As to cost - no idea!!