I've seen st holders that look like giant safety pins. It would be just like sliding the sts onto another needle, so should be really easy.
I use a crochet hook to thread scrap yarn through sts. Works easily as you slip them onto the yarn and drop from the needle one at a time. With a skinny hook, you can run the yarn right through the sts while still on the needle. If you don't have a hook, just thread the scrap yarn into a sewing needle.