Before running the spellchecker, enable (turn on) Track changes. Instead of correcting the foreign words, mark them with, say a hash sign and an at-sign at either end. Do likewise, obviously, for long sequences of "translatable" text. Then filter for the '@' sign and process the revision-marked text.
I hope this helps.
With kind regards,
Adam Warren (IanDhu - Translator 41189)
[Edited at 2019-04-17 20:01 GMT]
That makes sense -- I can export to Word and go from there.