A Vehicle Tech could get an OUTCAN posting once they are a CWO and on the Senior Appointments List, of course this means you are no longer a VEH TECH, but rather a CWO SAL, so strictly speaking a VEH TECH doesn't have OUTCAN opportunities, but a CWO SAL can revert to VEH TECH depending the next posting...
Either way, there are Any Trade Required postings OUTCAN at the CWO level (possibly lower, you could check on EMAA).