How Easy is Regional Lateral

Hi

I will start working in HK BB from June, and I recently changed my mind and now want to come back and work in NY (less than in one year if I can). My initial thought was to ask for internal transfer few months into the job, but I am worried that this might put me in an awkward position with the HK team. If I apply to other banks in NY, how would the interviews go? Do I have to fly out to NY each time I am invited for final round? Is it even possible to fly that often as 1st year analyst? Also, I need H1B Visa sponsorship to work in the US. This means that I need to get an offer before the April Visa deadline, and won’t be able to start working until October, which is when people can start working with the new Visa. Do banks wait for such long time (over 6 months) for lateral hires? How can I best approach this lateral hiring process? Any insight would be appreciated. Thanks!