There is no way around it keeping the name. Personally it doesn’t impact me because I’m going to change the Track Name to reflect its musical purpose (e.g. Sax Sect, Pad, etc.) so I don’t care if it has the wrong VSTi name on it for awhile - or worse if I’ve already named a Track “Pad” I’d be really pissed if Track got renamed to Halion because I changed the VSTi.
But if you want the Track Names to match the VSTi you are stuck with renaming it. An alternative would be to add an additional Instrument Track for each VSTi you are auditioning and put Shared Copies of the MIDI Parts on them and use the Mutes to switch what you hear. The Track Names would then match the VSTi Name and you could delete the Tracks you don’t want. Or maybe create create a Template with all your go-to VSTi’s and drag Parts around to audition.