This is a great idea. I have a right tilt blade and one of my gripes is cutting mitres on parallel sides. The first cut is fine, but when I turn it around to cut the other side the first mitre – now against the fence – has a tendency to slide under the fence resulting in an uneven cut.
Now that you have me thinking about it, maybe an even simpler solution (for pieces that will for on the table – not like your problem where it doesn’t fit on the table) is to tack a piece of scrap underneath so the first mitre rides higher on the fence and has no chance of slipping underneath. Thanks for pushing me to use my head. :-) And I’ll definitely keep your jig in mind if I have to cut a piece larger than the fence can handle.
Losing fingers since 1969