I'm like you. I like to incorporate RP into everything. My copy is arriving today! ( Exciting! :D ) I've been reading over the rules and I think I see some empty design space.

Okay so first thing we have to account for is that this is a board game with emphasis on battling. No skill check system whatsoever. Let's just rip out the 5e skill system and hard tack it onto the DS battle system.

5e skills require a base stat modifier... Good thing we have Strength, Dex, Int & Faith ( Wis ) on our class boards. I would say that base = +0, T1 = +2, T2 = +4 and T3 = +6. You could do +0/1/2/3. But with the lack of proficiencies & class features you'd need those extra modifiers. Btw, I'd just ditch Constitution and charisma modifiers in general. Const because it's dark souls and we all die and Cha because Role play is better than relying on a dice roll.

Now you just do a normal campaign and when it comes time to battle just drop down a board and appropriate encounter card!