In the end i decided to go with a Vectra M1 return pump and I will use either a Nyos Viper 3.0 or Marlin ECO-DC (4000l/ph) to run the chiller and reactors.
I was also able to mount the Vectra's controller and another bracket to hold my MP40QD's controller on the side of the electrical cabinet.
Everything is starting to come together. Will probably fill the sump later this week to test the return pump and the flow through the sump.