AFAIK there are no public access TENEX systems - nor emulated, I think nobody yet implemented the necessary BBN pager and I don't know if anyone recovered tapes with OS.
There are, however, publicly accessible TOPS-20 systems, including one at SDF which should be soon available moved onto recent~ish made physical PDP-10 system (a TOAD-2 PDP-10-on-a-Chip)