Before computers, when doing newspaper ads and other curves of copy for lettering, we'd just put some press type on a piece of paper, cut the little sections and make it fit whatever curve needed. It even works with French Curves.
So, instead of press type, use your vinyl on the backer with the application tape on it, cut it up, make sure it fits with a trial run, then remove the liner and stick it down, where it belongs. Takes about 2 extra minutes to do it this way.
The '
computer' is a tool and making them do everything when you don't know how, can be very tricky, especially when there's travel distance if mistakes are made. This will be only one trip.... there and back, so
cut the thing twice and make sure you get at least one of them correct.