The difference between "forever" and 1,000 in Hebrew is a jot or a tittle...can't remember which is which but basically it's a dot.
Can you show this other word and how closely it is supposedly written to chilioi?
I know the word used is a Greek word that can only mean a thousand of something. I also know when 2000 is needed, the Greek word for two is added to the word:
chilioi G5507 means a thousand of something.
dischilioi G1367 means two thousand of something.
"Dis" means two or twice and chilioi (G5507) means a thousand so this word means two thousand. Naturally then if there was one chilioi (G5507) it would be exactly a thousand just as it is in every occurrence of the word in the NT.