When I use "Go TABGROUPSAVE/O "!both"".
Providing the name will make it silent and override the existing group.
Go TABGROUPSAVE "!both,My Tab Group"
https://www.gpsoft.com.au/help/opus12/index.html#!Documents/Go1.htm
Of course I need it to overwrite some group, such as named "work" or "default", so I could use a hotkey to swtich it.