After a long, long hiatus on playing classical guitar, I have recently decided to start playing again, and have been doing so for a couple of days. However, I have a back injury and would like to switch from using a footstool for playing as soon as possible.

I have considered using a Dynarette style pillow for playing it, but I had tried one years ago and remember not liking it particularly. I have another guitar support at home, but it will only work with a full body, regular guitar, as it uses suction cups to attach to the body - which is not a possibility with the Yamaha silent guitar that I have.

I seem to recall having seen a type of guitar support that sort of clamps on from the sides instead of using suction cups, but I couldn't find it again for the life of me after some searching around.

My question is, what are my options? Does anybody have any suggestions and alternatives to using a foot stool with this type of guitar?

Also, I live in the EU if that makes a difference.