Considering your keeper value, I would feel great about getting Bell at 14. Seals him in as a 2nd round keeper for next time. In order to insulate the pick in your shoes, I'd be looking for another RB1 in that first round. Any of the guys you mentioned would be fine to me.. Miller, Ingram, Charles, Elliott, etc. Then I'm watching the WR tiers for rounds 3 & 4.
I don't think I'm worried about Williams until 4/5 round? Depends on your league mates... he's not worth a round 4/5 pick to anyone BUT the Bell owner, so anyone else picking him there is trying to block you or trade with you.
This strategy is expensive, but could play out really well. I think it means you can't really take upper tier QB/TE unless you're willing to be thin and upside driven on your bench. I like a deep, startable bench, so this strategy would most certainly mean late round QB/TE for me... targeting the likes of Rivers/Romo/Dalton, etc along with Barnidge/Gates/Thomas.