Destination wedding, sick grandparent?

Hi I just got engaged to my HS sweetheart 10 years later. Happiest time of my life. His job requires travel and we have spent the last 6 summers overseas. We want to get married overseas at this specific place because it is so meaningful to us and only a 3 hour flight but his grandmother can’t travel. In addition we have a large family and don’t want to spend 100,000k on a wedding.

She has fell multiple times in the last year. Now in a wheel chair and has progressing Alzheimer’s. We visit often but her memory is poor doesn’t even remember she saw the ring but she constantly speaks of the wedding for years and kept her dress she wore to her daughters wedding for ours.
She has been the backbone to our relationship since day one and I love her like we are blood. They too have the closest relationship.
I was thinking when we sign the marriage license in the US we can have a very special intimate dinner where we dress fancy and celebrate locally with our close family so she can be there.
But we still want to have the wedding overseas, has any one had this experience? Any advice on what to do): I don’t want to seem like an AH. My fiancé is going to talk to his mom and his 2 aunts.