I've never tried it but I intend to, using a jig with a guide bar as you suggestBut beware.
Ideally the infeed fence should be longer that the workpiece so that it is fully supported though the whole cut. Also if your edge is convex before cutting then there is a good chance it will rock against the fence and thus cause a curved outcome. If your initial edge is convex then make sure both ends are in contact with the fence at the start of the cut.
If you have a guide slot on your table use that and be independent of fences although you will have to fix a temporary guide batten to the underside of the workpiece
Go the full hog, get a Leigh FMT Pro FMT Pro | Leigh FMT Pro Mortise Tenon Jig Leigh FMT Pro and you're set for life! Suddenly jointing is great fun.I've never tried it but I intend to, using a jig with a guide bar as you suggest