Should be able to add a battery backup.

https://www.secamerica.com/how-to-add-a-battery-backup-to-an-existing-sump-pump/#:~:text=Luckily%2C you can in fact,pump using the Pump Sentry.

Tricky to elect younger & more competent when the older generation is so much more practiced at the schmoozing aspect, unfortunately. Not to mention better funded by special interests who trust their predictability.

Sometimes it’s good to know there are solvable problems out there… however small.

When it’s getting up to 92, is the air under the house still cooler?

I’d personally worry that even the smallest A/C unit you can get would be problematic in that small of a space. Might be worth air conditioning the rest of your house and unsealing the door instead.