Sure you can. He should be eulogized by whomever Nancy wants.
He can call Mrs. Reagan to offer private condolences. Perhaps he has done so. I'm sure she would take a phonecall from a former President.
But none of those things will suffice. He has to be IN THE MOMENT. The STAR OF THE SHOW. Too classless to even permit a widow to choose the speakers at her husbands funeral without sticking his nose in.
When my time comes, I'd rather be dumped in a ditch than to have a loathsome creature like clinton speak at my elaborate funeral.