I'm buying a few of these
http://www.tapastring.com/strapkeeper0605.htm
No need to hack away at straps or buy a specialised or custom strap. You use whatever strap you like and just use the strap keeper to "interface" between strap and endpin.
Nice helpful company. I've already mailed them and they assure me that the device will work with the LR Baggs endpin. The price includes shipping to any postal address in the world.