When I bought from an international seller several years ago I was aware of FIRPTA & figured that if the worst happened I’d owe 15% to the IRS & have to harass the title company to cover it.
Fortunately my escrow/title co. was very experienced & they handled the IRS (don’t know whether they forwarded the 15% to the IRS at the outset or held it in escrow until the seller filed their paperwork w/ the IRS & paid whatever amount less than 15% they actually owed

.)
That seller was prompt & we closed reasonably fast - they were in the UK, the price was decent & I’d been looking for a contract that size at that resort in my use year for a
long time - so the remote possibility of a FIRPTA mix up was a risk I was willing to take, especially since I’d worked w/ the title agent on another contract & I knew they had a good reputation.