You could try the resistor, I've never done that myself. I just keep a spare sender on hand.
Vacuum advance is not too hard to change, does not require major distributor dismantling. I get mine from the UK, not too dear.
Land Rover Discovery Defender V8 replacement vacuum unit Powerspark RTC3201 | eBay
0.8mm should be fine, providing the plug gaps are straight and unworn.
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