Hi Tim,
Not sure if this works for you, but giving it a try,
if you can get the GUID of the account object, we can get the Object using GUID in java action. ( Can check the GetGUID java action from Community commons )
In this forum post, they have retrieved the object using GUID: https://forum.mendix.com/link/space/other/questions/2847
Since the account object is generalized with System.user the GUID of both will be the same.
Hope this Help!!