Realistically, they cannot make him go and it would be very risky to physically go. No one sane would advise that.
That said, Andrew Mountbatten Windsor should be doing everything he can to contribute towards the Epstein victims receiving justice. And he did have considerable power to inflict harm and did, on innocent women who will live with what he did to them till their death bed.
This is not about some misplaced sense of British sovereignty vs American. Andrew Windsor probably does, in fact, know things that could be useful. Helpful, in corroborating some of the statements from either Virginia, or the other survivor testimonials regarding the other important more powerful men. Don't tell me when Andrew visited Epstein there were never ever any other men of note there. Don't tell me he was the only man of note on the Island. That neither Epstein or Ghislaine engaged in revealing intimate conversation regarding other individuals. He said himself in the EM interview that Epstein was useful as a man who helped connect him to people of influence that were useful in business. Which people? Even that testimony could be useful if one of the victims has also mentioned one of those names as an abuser. It can substantiate that that individual was, indeed, in Epstein's orbit.
There's a reason the Trade Envoy files have been effectively sealed as the Epstein ones have. There's probably some overlap between the two. The fact we've not made the TEF public shows we still have a way to go in delivering transparency and are as culpable of covering up corruption as the Americans and we're STILL protecting AMW and the Royal Family.
It's no point saying name the other men, when Andrew might be sitting on eye witness or other information that can help bring those other individuals to account. Even it's beyond statute, his word still ironically has power and authority to authenticate the voices of the victims in a way they cannot. According to her publicist/joint writer, Virginia apparently wanted him to come forward and tell what he knows for that reason. She desperately wanted his validation. That is tragic, to want your (alleged) abusers acknowledgement, to have to appeal to a man who raped you to get justice for yourself in regards to others.
It's unreasonable to expect him to go to America. It's not unreasonable for him to answer questions that do not directly incriminate himself. He described himself as 'too honourable' well, here's a chance for him to redeem his character. Mountbatten Windsor is still a name with substance, Prince or not.
He said he would help. He has a daughter who supposedly knows a lot about sexual trafficking and slavery. He could get her assistance in terms of knowledge about how to go about this.