I definitely have had to do that with many stock strings. It works fine, but it’s not ideal. You can go to the hardware store and buy cotton string, and cut it to the right length. It’s not the best string, but at least you can get a good length.
There is someone on here who makes excellent string, but doesn’t charge enough. He made some for me, and I still feel guilty to this day for not just sending him some extra money! ;D