I tried this recently and to get an exemption for the 750 hours ATPL ground school I had to have an ATP with 500 hours multi crew and a PC on that multi crew aircraft type in the last 12 months. I wasn't current so didn't bother.
Also to do the sim ride for licence issue (once a ATPL exams are passed and this will take 9-12 months) you must also have a PC on type in the last 12 months . So would need to pay for 2 PCs in the US.