So... there's no massive need i suppose... Strange, everybody is thinking about relocating the neckside straplock.

How about the one on the backside? It would have to move BEHIND the body, to the left that is.
The basic idea is as follows. A rather stiff strip of (chromed) iron, 2 mm thick, about an inch wide, in a 90 degree angle to make a hook. the angle a bit rounded. The inside of the hook rubber coated to not damage the bass´ finish.
One leg of the hook will be about an inch long, maybe a little more. The other leg about 3 inches.
In the short leg there is an oblong hole, to be able to adjust it to the thickness of the bass´ body.
Step 2 (see below for step 1): Unscrew the bottom straplock. Screw on the hook with a nice fitting/nice looking chromed screw using the staplock hole without drilling. It needn´t be screwed on too tightly. Make sure the long leg is fixed against the back side of the bass.
Step 1: Now for the long leg. In the leg there wille be a long hole with rounded ends. On the rubbered inside of this long leg space will be left to make room for the head of a small bolt, deep enough not to damage the bass. This bolt will fit into a straplock-shaped nut.
The long hole makes it possible to adjust the balance to personal taste by tightening the straplock nut in a certain position along the hole.
In most cases the straplock (that will be pointing at the player) is far enough to the right not to prick into the players belly
And nobody will see anything, it's all behind the body.
QED