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I was investigating concrete retrofits for brush curb.  I was able to find in the RDG Iowa's concrete block retro fit. 

Are there other concrete retrofit designs?

The Iowa detail in the RDG only shows a mid barrier cross section.  Does the end sections of the Iowa design have more reinforcement?

I was unable to find any other tested designs for concrete barrier retrofits.  There are other designs for retrofitting bridge rails, but they include steel and/or aluminum beam sections.  Additionally, there are other designs out there that have been / are being used as concrete barrier retrofits, but they are untested.

You are correct in thinking that the end sections of the barrier have to be strengthened due to the lack of continuity.  The original crash test report shows a 7 ft long end section that includes a thicker cross-section as well as additional reinforcement.  Please refer to MwRSF report no. TRP-03-19-90.  I believe the full drawing set for the barrier is available on Task Force 13's online Bridge Rail Guide also.