Maybe go and ask any garages near you if the have any valves stem seals with spring lands on them. Like these
https://www.eurocarparts.com/search/...RoCNAkQAvD_BwE
They will have a K baffle type shape to them .just cut the rubber seal bit off the top.
If I was still in engine recons I could have got 100s of them. We got the valves stem seals for head gasket sets and they were not used.
They come in all different sizes of lands (the washer part)
Paul