^ What he said!
Oh, if it's a one-off TV Movie/mini-series... tell the whole thing as a kind of deathbed confession by an aged Admiral Archer. You basically know Scott Bakula's not going to die during the Romulan War, so he's the one harbouring a disgraceful secret that could ruin how history views him and rock the whole alliance if it were known.
He tours the Constitution-Class Enterprise in 2245 (or 2258 if you prefer) in his wheelchair, gives a contentious interview to somebody forever just off camera in the framing sequences. He passes away. Then have a twist involving the identity of who he spoke to. Make the reveal something that really kicks the fanbase in the nuts and we're done with filling in those ENT>TOS blanks.