Have you thought about making multiple pickguards for this bass?
You said you wanted to try all different types of pickups so you can make a pick guard for each pickup configuration... I think this would be really cool and make your bass very unique and versatile.
I have thought about doing this and I am going to change A a little the next time I make it. But doing like you said making a different one for each pick up otion I try sounds like a great idea. Thanks!