So, I was wrong…

I was able to find a 1-5/8” tapered plane iron! BIN and with any luck I’ll have it in a few days. I’m cautiously optimistic that it will do what I want it to do. If it looks like it will do what I want I’m going to restart the 16th century mitre plane build. If it doesn’t then I’ll get to work on the chariot plane build.