Would've thought flybe would be good for the kind of routes in question, but I guess they're not interested cause they feel they already get the traffic through EDI/ABZ and to a lesser extent GLA.
Given the local population and tourist attractions in the catchment I'm sure there are quite a few routes that are viable from Dundee. The problem comes in getting airlines to operate them (especially if they already operate to the same destination from EDI/ABZ) and getting pax out the habit of driving to other Scottish airports to pick up flights.