I'm a German PhD student invited to a 4-week internship to the U.S. next year. It's a small software company, which is very closely attached to academia (scientific software, professors on the company board and so on). Additionally, I also got invited for two 2-week research visits in the groups of two professors attached to the company just prior to the internship. These two visits would also be at two different U.S. universities.
During the whole eight weeks I would not receive any salary or stipend but only reimbursements. The problem is that the first four weeks fit more to a J-1 research scholar program and the last four weeks would be better described by a J-1 intern program.
Is it possible to come to the U.S. on one J-1 visa but two different programs?
Can the DS-2019 form be transferred or "updated" to the current location/program?
I'm aware this is a unusual situation and useful information from government pages is very hard to come by. I definitely appreciate any information which helps clarify my situation.