ahh i got ya.. well if ya lift the lid to check the roots or other things you should tie down to that lid. maybe just glue some plastic hooks or zip ties to it.. Grumpazz put eye hooks in his lids and he really liked having them to use..
another option might be a wire table with legs that you lower over the plant like a scrog screen in a way.
a lot of times i just like to use a stronger branch to keep a weaker one to the side, thsi way the plant cans till be moved around while still holding its shape.
but honestly if you're just looking for something quick and easy and just want it for now and will remove later, then i would just duct tape something to the bucket or something like that.