i've found a few custom decal makers on Ebay over the years.... many can work from decent pics sent to them
you might get some help from these good folks... they are the largest repro bike decal maker in the USA.
they list a lot of schwinn decals, and may want to add your particular ones to their database, if they don't already have it.
they printed just about EVERY decal ever put on a USA made bike since they began production, is the rumor...
chances are good that they made the decals that are on your bike now...
https://sssink.com/restoration-decals