I question why old school motown needs to have old school bass tone. I mean, don't go hifi overdrive, but this is 2021, not 1967. The guitarists aren't trying to use old school strings and tones I bet, and the drums aren't going to sound like they did in 1967 I bet, so why do you have to?
Also, the band leader doesn't care, and in the show you can't hear the difference very well anyway.
I slightly palm mute when needed (on sustained notes, and yes I play finger style) but not most of the time, in this style of music (or any style where it suits). I play neck pickup for a precision tone, or both on if it suits better. whatever works!
but changing strings simply for the change in tone, for a one off live gig, is not likely to be a very big change. imho, yadda yadda