Hey Tom, you are absolutely invited, no apologies necessary!
What you suggested was actually my first thought. However, it was going to be cheaper/easier for me to modify my existing plate. Additionally, I like the new design better. My biggest hesitation was trying to figure out how to cut the 4" off each side of the plate, and then realized I could actually do it on my mini mill, in a 3" vise, no less! Time-consuming, but doable. Got the extrusion ordered as well.
I could probably have had the vendor that made it in the first place do it for me, but that would be extra time & $$, and wouldn’t be able to have it done until after the first of the year. This way, I should be able to have the steel plate done tomorrow.