Just wild speculation:
Given that you are only allowed to deploy 4MJ from ES to MGUK, but there is no limit in energy flow MGUK <-> MGUH neither in ES <-> MGUH, it seems feasible to switch the MGUH in a "conductor mode" to deploy more energy from ES via MGUH to MGUK, to use MGUH as a sort of "wire". Or replicate the Honda "extra harvest" as a "extra deploy" accelerating the MGUH and getting that kinetic energy going to MGUK in a cyclic mode.
Edit: Obviously getting the MGUH switched in "wire mode" could be exploiting a grey area.