"advertise this new name resolution" – specifically declined, because rogue DNS in China/iran/… can just "advertise" security while censoring everything.
"OSS implementations" – hmm… https://www.aaflalo.me/2018/10/tutorial-setup-dns-over-https-server/ https://doh.defaultroutes.de/#text-5-2 and https://github.com/m13253/dns-over-https is what a quick search tells me. Totally possible to setup your own server.
DNS stays distributed, just people need to setup servers. And this, is what we need to advertise. (e.g. to Digitalcourage or so)