Dres is probably the most ignored planet in KSP and for good reasons, it costs more dV than Bob or Pol (mainly Tylo's fault) and gives less science (I think) than the mentioned moons. And overall does not offer anyting that the Jool system can't (in terms of science and funds.) The solution, give Dres moons. To justify the cost of getting to Dres, these Moons should be small and easy. The innermost moon Lun should be a radius of 85 km (just under half of the mun) and be a cratered grey rock. The second moon out named In should be a little smaller than Minmus at 50 km and be grayish blue. The dresteriod region should have a ring system (Haumea likes this) with 1 Gilly sized moon. The outer region could have up to 5 Gilly to Bop sized moons, some with inclined or retrograde orbits. These changes could make the Dres system a good alternative to Jool or act as a stepping stone for less experienced players to help them unlock more techs before going to Jool. Dres has so much potential! Please give Dres some love devs.
Edit: In this scenario Dres would have it's radius increased from ~ 130 km to ~ 185 km (mass would be adjusted too)