By the time we have the data you are asking for, it will be too late to control the variant with low cost means. Test and trace doesn't work on high case counts.
You're essentially arguing that masks are so bad it is worth risking a shutdown to avoid them.
Well there it is. "too late to control the variant". You are still clinging to the illusion of control. Again, only western places that have managed to control it are Australia and NZ....you want to control it a good start is getting the border under control....short of that anything else is futility....talk to me when that's fixed and maybe I'll be open to it but otherwise you are just trying to corral the horses with the barn gate open.