Alternatives to conventional weep screed, for stucco to the ground homes?
I would take an angle grinder and cut a 1" channel in the stucco right where it meets the concrete foundation. Then you can slip some new tar paper into the gap underneath the existing (probably deteriorating) layer. Should help a bit. It's also enough of a capillary break to stop the rising damp and will allow you to inspect for termites.

Long-term, the best solutions would be removing and re-applying the stucco (possibly not as expensive as it sounds) or applying a new layer of stucco over the existing layer, with a few inches of rigid foam between old and new.