You asked for ideas, so here's mine. Buy another set of wheels for the Volpe. Lighter wheels and smaller tires are (mostly) what will give your bike a more "spirited" ride. As capable as that bike is, in stock form the wheels and tires were built for reliability and toughness on a variety of surfaces. Put some lighter rims and a set of 28c Continental GP5000s on that bike, and you'll feel a huge difference. There are maybe a few other changes you could make, but wheels always make the biggest difference.

Then you have two wheelsets that you can swap in an out depending on where and how you're going to ride. Almost as good as having two separate bikes.