is it possible to be elegible to work with RNE?
No, until the law changes (if ever
) it is citizens only, either by birth or naturalization, in civil aviation (and some other industries). With an RNE you can live and work here, but not as a commercial pilot.
Expats can work in very unusual cases and then only on a temporary basis until a national is suitably qualified. IIRC the last situation was offshore heavy helicopter flying in RJ or ES, however regular line flying for a local airline doesn't fall into this category.
TTFN