Why not just buy a part-worn tyre for the spare, that's what I've done in the past? It doesn't even have to be exactly the same tyre, though the closer the better in design and ideally same brand/range.
e.g. When I moved up to Michelin Pilot Sport 4S all round I had a Pilot Super Sport as spare. More than adequate for the job.
Then, when the inevitable happens and you need to replace one tyre due to an "incident" get a nice new matching pair and fit them on the road wheels. I never remember whether the better/new tyres should be front or back.
Scrap the spare tyre and use the worst of the three once-new tyres for the spare.
As for rotational tyres I personally avoid them for exactly the complications you've raised. The spare only has a 50% chance of being fully useable.
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2003 D2 FL S8. Irish Green Pearl/Beige. Solar sunroof, auto-dim mirrors, electric rear seat functions, ski hatch retrofit; extended leather. Aftermarket DVB-T, reversing camera and full XCarlink (Bluetooth etc.).
2016 Volvo V40 T5 Cross Country (4WD) with ALL the toys including adaptive cruise etc. etc. Osmium Grey with Blonde/Charcoal leather interior. Polestar performance "optimisation".  (A much rarer model than a D2 S8 by the way!) Oh, and a brand new engine at just under 30,000 miles on the factory one! 
Finally: gone, but not forgotten.....
1998 D2 PF S8. AgateGrey/Platinum. Every option (I think) except electric rear seats, tiptronic steering wheel, ski hatch, towbar & dimming door mirrors.
e.g. Cruise control, NavPlus/TV, Bose, GSM, Xenons, Solar roof, Parking sensors, Alcantara/leather everywhere of course.  (internal dimming mirror added later)
1998 (very early) Ford Focus 1.8 Zetec; ABS/TCS, Heated screen/mirrors, Aircon, Auto-dim mirror, Leather, Trip computer, Cruise control, OEM Ford SatNav with CD changer.
And before that a lot of Rover 800s, a few oddities, a lovely Triumph Dolomite 1850HL with Overdrive and way back in my schooldays an Austin Seven aka Mini 850!
Last edited by HPsauce; 10th September 2022 at 08:37 AM.
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