I was reading my Bass Player Magazine today when I found this David Gage's advertisement about a new piezo pup called the "LifeLine". From the description on the website, it seems to be located in the bridge adjusters area with no mod required. If they come up with a design ala full circle that actually sounds good with arco, I might give it a shot!

https://www.davidgage.com/lifeline.php

Does anybody know more about this?