That's easy enough to do with my design, just add a piece of wire insulation from which the wire has been pulled into the twisted, color coded pair of leads.
Make it long enough and it could act as a drain to the outside of the case. ;D
No problem add the toilet paper pad underneath the two battery base during the initial binding wrap of of the the three cells. There's provision for plenty of extra space in between the batteries in the pack which is reserved by wrapping the assembly in order to minimize the surface area and simplify the topology of the pack.
Heck, wrap it enough times with electrical tape and you might be able to skip the tool dip altogether.
"Rubberized" tool grip liquid is both acid and oil resistant besides being non-conductive and fairly elastic. I'm sure the properties/makeup of the material is easily researched. Corrosion prevention shrouds for lead-acid battery terminals in cars appear to be made of the same or similar liquid -> solid phase change materials. The ones I've seen haven't appeared to be made by a casting process, but I'll take a closer look.
Dunno about the acid or oil resistance of liquid wire insulation, the purpose of that material is waterproofing spliced connections in outdoor, underground or interior wet space applications where shrink wrap isn't sufficient or won't work at all.
PRAM batteries or packs should be removed for long term storage to begin with, they should at the very least be disconnected for medium term storage to preserve the charge anyway, so they may as well be removed entirely as well.
Barring catastrophic failure, any Homebrew PRAM Battery Pack will have ceased doing its job and should have been replaced long before the "normal" types of battery disintegration occur.