I'm guessing you don't see any replies because most folks here haven't done such a thing.
If I were going to do it, I'd probably start by looking at what people do for treble bleeds on their guitars (assuming this is a passive VP, which wasn't mentioned). There are a bunch of different values people use, depending on their pickups, what they're going for, etc. It shouldn't be too difficult to experiment and find what works for you.