The B&B can call a taxi for you but I don't know how long you'd have to wait. Then after dinner the restaurant will call you another taxi to get back.
But since you have a car, you have so many options a bit further from the Temples where you could have an agritiruismo experience and a dinner at the farm...
Ginevra, the owner of CIUCI'S MANOR is a bit of a legend among some visitors to the area; take a look at the website and see if that appeals..I'm mentioning this only because of your interest in food...
I recommended the place we stayed last time, up above; BORGO DELLE PIETRE; it's more stylish than Ciuci's Manor but does not have the farm and the animals.....it's more of a refined small rural hotel with excellent food.
Also take a look at LA CASA DI BACCO, about 20 minutes's drive from the Temples. Agriturismo noted for good food with dinner on site. Homey..
You need to see photos of the rooms in the agriturismos that might interest you; they can vary according to price and I would never recommend taking the least expensive room unless I has personal recommendations from someone I trusted who had stayed before. But (you probably already know this) a night or two at an agriturismo will give you a window into the Sicily that not many tourists get to view.
If you decide to try LA MADIA, make sure to book on their site as soon as possible and they fill up, especially for lunch, in high season. You can park on the street near the restaurant but since you will have your luggage in the car, I would contact them and ask about parking options.... Mandranova would be another option for a meal and they have their own secure parking lot but I've not eaten there.....but their olive oil is wonderful, some of the best I bought on that trip....
Catania is such a wonderful and alive city; it's too bad so many trailers give it a miss; I'm glad you planned to stay a few days after giving up the car!! It's filled with great places to et, each one better than the last!!! We really enjoyed LE TRE BOCCHE (seafood) last September but again, it's one of so many great ones. You might e the only tourists in the place, as opposed to the place featured on the Tucci CNN series, MI CUMPARI TURRIDDU) which has become a little overrun with tourists since his show but it's still very, very good......(do not miss the donkey!!)
Speaking of Modica chocolate, I bought about three dozen bars in 2023 and another forty or so last year. At this very moment I am down to my second-to-last bar and I am bereft at the thought of not having any to look forward to before bed!!!!! Surprisingly, I liked the Bonajuto chocolate less than many of the other brands. You can find Modica chocolate all over the SE so you do not "have" to visit Modica to buy it..... There are SO MANY amazing flavors, I could ramble on and on about my favorites...but do not miss the gelso (mulberry) if it's in season; I also like the peperoncino, the sale, and the agrumi (citrus) flavors but you are sure to have your own favorites!!! And the packaging is too beautiful to throw away!!!
If you buy a lot of food items, it's easy to ship them back to the US; I do that now rather than worry about jamming everything to my suitcase.....just the cheeses I put in my checked bags so it remains cold.