If the +1 was for example a US Citizen there would be no issue and they would cover your expenses as defined.
But you are not so the only option you have currently is to visit, I assume you can use the VWP which is up to 90 days, I would not push it that far, and that you will find out in April what sort of expenses they will reimburse, flights, living costs whatever. Maybe x flights a year and a per diem?