Using /acmd GO "$FileDir$" NEWTAB=tofront is probably your best bet for now, if you need it to be a single command.
(It is possible to do it without opening a new tab, but would require either running two separate commands or creating a user-command, script-command or batch file that could act as a single command which then runs two commands.)
[li]Once we release Opus 11.16.4:
You'll be able to use /acmd GO "$FileDir$" TOFRONT as we have just added a TOFRONT argument to handle this case more easily.[/li][/ul]