Hi Stevie after looking at your jig and provided bit, I had never seen a DT bit with a bearing before. The Manual says you can use a1/2" guide bushing with a 1/4" shank and a 1/2" 14 degree DT router bit. I don't see how a 1/2" wide bit will fit through a hole less than the outside diameter of a 1/2" guide bushing.
DOETAIL ROUTER BIT AND BEARINGS
Included bearings are 1/2 in. outside diameter (OD) and 1/4 in. inner diameter (ID). Router sleeves
or bushings can be used in place of the guide bearings as long as they are also 1/2 in. OD.
Included router bit is 14˚ x 1/2 in. Other bits can be substituted provided they have a 1/4 in.
diameter shank have no greater diameter than 17/32 in.
But anyway I found a bit that might work. It's Rockler's bit and there are some reviews that may be a deal breaker. You might want to call Rockler before buying and get some assurance it will work for you or guarantee of a return if it doesn't work for your jig.
https://www.rockler.com/14-dovetail-pattern-router-bit?gclid=CjwKCAiApOvwBRBUEiwAcZGdGFG7L5kq6eonQwsH0tFXSpIqtdAI9BBtkheEbTewgMxebzy6q0wOdRoC3OgQAvD_BwE