There are racks that extend back a little further. You could also have one made custom.

I use Deuter panniers. They go on in 2 seconds. At the end of the day you simply lift them off the bike.

Let's look at a couple options you may not have considered. We do credit card touring. A couple panniers in
the back weighing about 20 pounds loaded. That's not bad.

We also do day trip vacations. So we drive around, stay in hotels and B&B, and ride the nicest roads.

We went with a vacation company once (Ciclismo Classico) for a ride across Italy. That was nice.
They took care of the luggage. They also picked the hotels, restaurants and wines.

I used to backpack and do bicycle touring. Now that I am old, I take it a little easier, and it is ever so
nice to have a good bed and hot meal just waiting for us to show up.