Assuming that this doesn't happen frequent enough to warrant changes to the system, one approach that comes to mind is to flag these cases for moderator attention.
Flag message explaining the issue could refer this very question, in order to make it easier for moderator to find more details, eg like as follows:
please take a look - this off-topic question appears to be posted with sole purpose to circumvent 'problem' title block at Stack Overflow (related meta discussion: https://softwareengineering.meta.stackexchange.com/q/7221)
Because, really, what's the point of wasting precious close votes on an issue essentially caused by some kind of a system "leak".
Note, per discussion in later related question, some moderators are not positive about flags like that: Is it okay to flag for moderator intervention attempts to circumvent question block at other site?
On another note, you may also stumble upon an earlier post that recommends this approach...
if you see someone that is very likely unable to ask questions on one site bringing the same poor quality here - flag it
...but you better keep in mind that above guidance is not universally accepted. At least not currently.