Hi Alex,
instead of providing a search result which is not really useful for the internal candidate as he has to search through / test which jobs he can actually apply, why not restricting the search result to the jobs he can apply in the first place? This could be done using the HRRCF_SEARCH_HIDDEN_INFO BAdI and depending on the requisition reference data an addition to the search profile of the publication.
For application consistency make sure NOT to offer a region select option in the search itself as this would indicate a function which does not exist for the candidate.
Kind Regards
Roman