Just look at how any model with light wing loading lands, and you've got your answer. You can land lots of light models at almost walking pace even without flaps. Some of the foam, rtf trainers can be "hovered in" in mild breezes.

Also, what Andy Lennon wrote about really did happen, so you've got your answer there too.

Thousands of gliders have used simple flaps for descent control out of thermals and for spot landing control. The flaps work so well, it's really not much of a trick to bring your glider right up to your hand. You simply reach out and take it out of the air. Another answer there.

Would they work? They have, no reason they won't for you, so the real question is what are you waiting for if you want to have fun yourself.