Well I swapped the bridge and middle pickups over (no de-soldering)...
I like the soloed neck pickup, very Precision, not least because it sits in the same place in terms of the speaking length of the string. Not so keen on the bridge/neck ('Jazz') setting, again no surprises because I don't really enjoy Jazz basses.
Consequently I'm thinking of having the following 4 options: bridge, bridge/middle (parallel), bridge/middle (series), neck. If I can re-purpose the existing 4-way rotary to achieve this, that's a win. I'll still need to re-wire the neck pickup from parallel to series, but that's not hard.