Dodge can only support parts for so many years. At this juncture our trucks are 14-16 years old. After all, you cannot walk into a Dodge dealer and get a fuel pump for a 69 Charger with a Hemi?
Get the Genos pump, install it and go another 200K. Mine went out at over 300K I believe, I checked with Dodge, same story. I went to Cummins and they had the pump on the shelf. I took the pump to the Dodge dealer and they installed it.
This is the same with the vacuum pump / power steering pump sub-assembly. No rebuild kits from Dodge, but Cummins carriers the o-ring rebuilt kits. Dodge wants $1,000+ for a complete replacement unit.
NO on the electric pump, why complicate your truck??... go with the OEM mechanical pumps from Genos or direct from Cummins.
When you are running vehicles this old, you have to get a bit creative when it comes to parts.