In a nutshell, no.
First off is the right to work. Without citizenship or the green card, your chances are next to zero.
The license conversion isn't too hard. Just the IR and CPL
exam. If you don't meet the requirements for the ATP, then no point in taking the exam because the exam is only valid for two years and the "frozen ATPL" concept doesn't really exist like in Europe. The written exams are not too hard but you will have to pass the flight tests. The orals can be quite in depth and the CPL maneuvers will require some training to familiarize yourself with them.
A regional airline job requires somewhere between 700 and 1200 hrs as a starting point. Bizjet jobs require a bit more typically due to insurance and you often have to have a good "in." a good friend of mine was able to get a Bizjet job with around 1200TT, but he has been at flight safety as an instructor and was offered the jobs by clients. (plus he is a US citizen)