Since you are also interested in C. S. lewis, as are many of us, maybe the LOTR Ping list could be expanded to an Inklings Ping List? That would include both of them, as well as Charles Williams and others.
I don’t know how the current members would appreciate an expansion; would it be more feasible to create a separate ping list for the Inklings?
There is a Narnia ping list, which was kept by DaveLoneRanger, but has since moved on to BlackVeil I think.