I hear you, the tap on Amazon I found is only lile 12 bucks, so maybe worth buying and keeping or , sure if your savoy, can re slit it for sale and re coup most back?
better than waiting maybe
I am lucky I am personal friends with a few gun smiths for decades and have a few friends that are machinists by trade
I also have a few machine shops near by that do work pretty FAST, they don;'t like things laying about, its IN and OUT type of place
as NOT all shops or smiths are the same?
so, I would suggest looking else where if you don;t want to make it yourself by buying the tape!