That is possible and is provided for in smit:
fastpath is smit restmksysb, command is restorevgfiles
mkdir /tmp/restoredir
restorevgfiles -f /dev/rmt0 -d /tmp/restoredir ./etc/passwd
Yhe command is in fact a shell script, so feel free to check it out. What it does is skip to 4th tape file and restore the specified file(s) to the specified dir (or the current dir).
HTH,
p5wizard