Europe travel advice France/Italy/Croatia? (approx 1 week w/kids)

Family of 4 with 2x kids 7/10. We are stuck.

Going to Europe for a wedding in Tuscany in June/July

So far we are flying into london, moving to paris after a few days, going to disneyland.

From there we have approx 3 days before the wedding. Then 7 days before we fly out of rome.

Another way of thinking of this is we have 2 weeks, of which 4 are in Tuscany.

We were thinking about flying into Milan prior to the wedding. Going to Croatia for 5 or says post wedding and then spending a day or 2 in rome prior to flying out.

But maybe staying in italy would be better? Trying to find something that is both somewhat relaxing but would keep the kids occupied (activities, other kids, interesting things). My littlest is not really a hiker.

Other thoughts were Amalfi, Bari, Capri, Pompei, Lake Garda. We have done Venice before so other than maybe a day trip for the kids, not real interested in that again.

If we are in Croatia, we were thinking about settling in around Split/Zadar and just chilling doing a day trip or two to the lakes and the like. But its much harder and more expensive than we thought to get to/from and stay thre.

Any thoughts or suggestions that is not going to break the bank?