It would be interesting to consider a "coaler" style solution for turbofans rather than the props. Unfortunately you would need a new wing, and maybe an even bigger tail design if you were to move away from the prop driven option. Say approx 3 years of solid work from aero concept to production.
The prop flow has to be a huge factor in the loads/aero.
I had the 'pleasure' of working on the wing. Glad it was only a fleeting visit.
I'm also glad I wasn't one of the guys drilling out fake battle damage in their NBC kit, inside the box, in summer. Full respect for them for cracking on with it.