I am using the Latin keyboard in making my OpenType Tengwar Font. Unicode will never accept the Tengwar and I do not blame them for that.
The Fëaorian zero exists already (see my previous post) and it has already 3 glyphs (plain, with a dot and with a circle).
How to get the Hobbit's zero then, in a logical an easy way to remember?
You type the word "zero" and apply "standard ligature".