Is there a reason you want to keep the odd angle on the top? It would probably make it easier to do on the DP if the end angle was always 90, or at least always the same. The drill press has a stop you can use, but for production, you'd need to set some kind of measure on the jig so the top was always the same height, relative to the bit.
So cutting the end to an exact angle will require a table saw "cradle" to hold the odd shaped pieces as straight as possible to have the end cut. If you want to have a certain angle to the end, you can set the saw blade to that angle. Same would apply to whatever saw you want to use, chop or band saw.