When his bride loses her memory of him a week before the wedding, an unromantic guy’s guy must restore it by recreating their courtship’s most romantic moments or face losing the love of his life.

The first option in the last draft of the logline is too wordy for a logline, best to get to the plot quicker than try and over describe the elements in the story. Example: "?love of his life?" = bride, "?rough around the edges guy's guy?" = "?guy's guy?"

Providing that losing ones memory is a credible premise in the story shouldn't she need to loos memory of him not their courtship. Forgetting how they got together is not such a big deal as long as she remembers who he is and how she feels about him.

Better for the story if she forgets him all together the stakes are just not high enough otherwise to make the story interesting for a romantic comedy.

The second option of the last draft doesn't describe a clear main action and therefor a clear plot. The term "...pulls out all the romantic stops?" is a vague description of action as the reader doesn't understand how the MC will do what he does.

I think the first option is better but needs to be leaned up.

Thanks so much for your comments, they have been very helpful. Let me know if either of these is an improvement?...
When the love of his life loses her memory of their courtship a week before the wedding, a rough around the edges guy's guy must persuade two icy bridesmaids to help him romance his bride to the altar.
or...
When the love of his life loses her memory of their courtship, a rough around the edges guy's guy pulls out all the romantic stops to persuade her to go through with the wedding just days away.

very good LOVENESIA
and the tag line "they're to be married but she soesn't know"

If you want to go deep into comedy, it could be a rare disease, a kind of amnesia who shake lovers before marriage - watch ZEROPHILIA, about a rare genetic disease - I watched it just because of the title!
In this film the shrink explain what is zerophilia and how to cure it, in your case the shrink can have the same role: he tells the rules to restore the memory so no more problem about medical realism, you just have to be true to the rules of your movie.