The guitar that is on the way now, will have a Lowden style bridge, with a split saddle and without pins. Like this original one:

Below the saddles , there is a slot about half deep the bridge's height.
How to make this? I'm thinking of routing it with a round top bit 1/3" wide.
Does someone had a better idea? chisel? rasping? sanding?
Thanks, Herman
BTW, It is Wengé, so splintery