Can I temporarily redirect an agent to a different OMS without losing all the infomation in the curr

We are trying to come up with a process to patch our Production OEM install (12.1.0.4) while still monitoring the Production targets.  Our thought was to temporarily redirect the agents to our non-prod OMS (also 12.1.0.4).  According the documentation (https://docs.oracle.com/cd/E24628_01/install.121/e24089/appdx_repoint_agent.htm), you must remove all the monitored targets from the current OMS before redirecting the agent to the new OMS.  This will cause us to lose all the history associated with the production targets, which we want to keep.  Is there some way to temporarily redirect an agent without removing its targets from the current OMS?   Or is there a better way to accomplish what we want?