I made a tool for the plugs:
https://flic.kr/p/muMaK8I used a hair drier to warm the area gently and was able to free them all using that tool without damaging the outer surface of teh plugs or the headlining itself - and the plugs still look good enough to use again:
https://flic.kr/p/muP4C3As an aside, it was nice to see that the zinc bath dipped steel frame of the car is still like new after over 30 years
https://flic.kr/p/muP3Bq:
https://flic.kr/p/muMNLaThe removed lining and card:
https://flic.kr/p/muP3Yshttps://flic.kr/p/muMPVpTaking off the lining:
https://flic.kr/p/muP4ZqI vacuum cleaned both surfaces, as the spray-on glue instructions say the surfaces should be dry and dust-free.
I sprayed the card only: this is option 2 with this glue. Alternatively, both surfa es can be sprayed - in which case it acts as a contact adhesive, which I thought was too risky. The third alternative wpuld be to spray one surface and wait 20 minutes before joining. This would permit later separation and re-joining numerous times according to UHU.
After spraying the card, I immediately put the lining into place, adapting it with the handbrush visible in the previous pic above.
It now has to dry for about 24 hours.