I think you may be overthinking future relay removal.
A decent coat of paint on the relay and inside the tube in the chassis lasted 30-40 years. I haven't had any rusted in, it was just the buildup of dirt that slowed their extraction. I'm sure some rust in place because they've been parked in the open for years, most won't get treated like this if someone is going to the trouble of overhauling the relay.
Grease, anti-seize, grease tape etc will hold the dirt. I'm not sure whether this makes the situation better or worse.
When new it was probably used as a daily driver for many, many years in all weather so there was a lot of water & road dirt going down beside the relay. Most nowadays will be lightly used and mainly on dry days.
I went through this thinking process with one of my Land Rovers, do I grease, maybe silicon around the top to stop the water getting in, fit an O-ring around the body of the relay to stop dirt getting down too far ???
I then realised that if I do a good job of overhauling the relay and then maintain it there will probably be no need to remove it again in my lifetime.
By all means grease/anti-seize/tape but I'm not convinced it's needed.
Colin
'56 Series 1 with homemade welder
'65 Series IIa Dormobile
'70 SIIa GS
'76 SIII 88" (Isuzu C240)
'81 SIII FFR
'95 Defender Tanami
Motorcycles :-
Vincent Rapide, Panther M100, Norton BIG4, Electra & Navigator, Matchless G80C, Suzuki SV650
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