Big Al said "i've got to do some gigs where i walk round. not keen on the guitar strap!"

What's the issue with the strap? Uncomfortable, can't get a good playing posture?

How do you currently have the strap set up? If one end goes to the head of the guitar, I can understand your issue. I only think you can get a decent posture with strap buttons on the guitar body...

The classical guitar strap with a hook (anyone remember Pete Atkin and Clive James' song "Thief in the Night" - "Around his neck a ribbon with a slender silver hook, like some military order, second class"?) has its own issues as others have pointed out. In particular, it relies on you continually holding the instrument in place.