Well, I'm going to be the first - and very possibly the only - FT-er here to recommend directly that you go for option 5.

It is obviously inconvenient, and somewhat tiresome, yes.

However, it does have the benefit of avoiding any of the potential hassle & complications that could arise from options 1-4.

It also means that you are doing "the right thing" in fulfilling your part of what is, after all, a contract, and thus with zero possibility/concern of later receiving any unpleasant letters, or putting at risk - however remote - your mileage earning and/or FFP membership.

In saying this, I am very much aware that it will be seen by the vast majority (perhaps even 100%) of battle-hardened folk as a wimpish, overly-cautious and totally unnecessary approach, so I leave you as the OP to make of it what you will.

There....I've said it