before adding the ribbon- or bias strips you might want to put some fray-check over the fraying edges- just to keep them from fraying more- and then it will just depend on the ribbon being what you hope it is when it arrives.
making your own could still be an option-
to do the bias (tape) yourself- you cut your bias strips- pin a large safety pin to your ironing board-leaving enough room for the folded strip to pass through- fold your strip- push the end through the pin- start to press-pulling the bias strip through the pin as you press it-
i hope i explained that so it makes sense- sometimes you just have to give it a try to figure it out-
beautiful quilt- i hope how ever you try works out.