I think I watched this a loooong time ago, and have found it again.

Young guy doing a great job. But I am sure I have also seen something with someone sawing and/or carving out the actual screw-thread ... at least as a first or second approximation. Not sure if it was Youtube - but I can't think what else it could have been. Anyone else?

Workbench Build - Splayed leg French Bench #3: Tap for Wooden Nut - by Mauricio @ LumberJocks.com ~ woodworking community
Tap and Screw Jig Tutorial #1: Intro/Screw Dimensioning - by CartersWhittling @ LumberJocks.com ~ woodworking community

This process is general ... so you could use any pitch and diameter you like.
All his videos - you'll see the sequence ---> (MrCartersAccount's channel - YouTube)
Starts with ...