Well, I was just musing in general about the reason for "Artifact Titles," not seriously advocating a given position re: the title of a hypothetical TSJA continuation. But I don't know if I'd agree that it's in bad taste to pay tribute to a beloved character played by a departed actress.
In that vein, Taggart justified the continued use of the title by occasionally having other detectives say things like "Oh, you're Jim Taggart's team," (often as a dig at the inexperience of the young detective who'd been promoted into his place), which was eventually formalised by having the Glasgow Murder Investigation Team officially named The Taggart Team. So you could have had UNIT and similar make references like:
"Oh, you must be Sarah Jane's kids..."
"We're NOT kids, mate."
"Of course you aren't, Sir."
BTW: as a coincidence, Lis Sladen and Mark McManus (who played Taggart) had the lead roles in a training film for people setting up their own businesses that they must have made sometime in the late 70s or early 80s.