TES4Edit allows for this but only one at a time and for each you must right-click and add a new record. Cool, but quite tedious for numerous entries!
I was looking into exporting to CSV or some other database-able format, however I cannot see how this is possible in the CS or Wrye for these specific field types.
OBEdit says it can only edit one file at a time. I'm not certain if that is why it is unable to load my plugin with multiple masters.
Anyway, shy of a hex editor type program I'm drawing a black, and I'd be paranoid about format corruption.