Richie
Naybet
You are aware that's more or less the top 7 that just failed at this tournament, bigger changes are needed than using existing players in a slightly amended order. Stokes should be in there as an all rounder option. Bopara has good experience, can bat and can fill in for 3/4 overs as well and is a decent fielder. Carberry should be given some games, done well in the shorter form. Is a bit old I agree but worth a shout.
I don't follow country cricket enough to know who else is up and coming.
Bell shouldn't be in there, doesn't score enough in the big games or make those telling contributions. Great stroke player but doesn't have a big enough impact for me.
You can't just clean house with your top order though. I'd consider dropping Bell for the reasons you've said and Morgan because he's so far out of form but at you need to stick with your best players. Take out Bell for Jason Roy in my listing and you have 3 new batsmen in the Top 4, that's a petty big change.