Welcome!
The general rule of thumb is that you loose 3# for every inch less than the 28" of draw length. That would mean that your 50# at 28" recurve is pulling about 39 1/2# at your 26 1/2" draw length.
Before you go shooting any of those light weight carbons you had for your compound set-up, I suggest you make sure they aren't too light for your recurve. We don't want you to get hurt and we don't want you to hurt your bow. I'm also betting that all of your carbons are too stiff for your recurve. If you tell us what arrows you have - type, length, point weight, insert weight, fletching type and length, we can help determine if anything that you have would be good for starters.