Hi Esther, Good to read about the beautiful Oak. Have you looked at Linda Runyon’s books? She uses every part of a tree! May be interesting for you to read.
Also, I had not seen an Elm before coming here as in the UK they are almost wiped out. The system in the Netherlands seems to do quite well at locating them (I believe “they” fly the streets looking for signs of infection and then cap those which show issues to reduce the rate of beetle transmission to other trees. I find it sad for the trees in one way but not many places in the world have so many Elms these days.