Would the macro, that boots (or rather reports as AFK) anyone not from your own server work.
Or an adaption of that?

/run for i=1,GetNumRaidMembers()-1 do local unit = "raid"..i local name,realm = UnitName(unit) if(realm) then ReportPlayerIsPVPAFK(name.."-"..realm) end end

If I'm reported as AFK in a battleground, when I'm not AFK...
I have all of my toons run that mapped key.
What goes around comes around.