It depends, I know several colleagues who came from Australia, US and Latam, and currently working in EU. However, there were 2 mayor factors I have noticed:
- the first is obviously the experience, so with 270hrs you won't make it, all of them came with over 2000hrs, and I might be wrong, but I guess EASA regulation requires 1500hr multicrew experience in order to start the license conversion.
- the second one, is all of them have either dual nationality (one of them being EU) or they are married with an EU citizen.
I know some companies would take care and help with the EASA conversion, on paperwork and cost. But I don't know if any company who helps you with the work/residence permit, since this process takes very long, maybe there are, but don't know any.