Personally, I never use 'would' that way unless I am attempting to jokingly imitate a famous poet from hundreds of years ago!
It is good that you understand that usage of 'would' so that you understand poetry or very old literature, but I strongly recommend that you avoid using 'would' that way yourself.
Yes, dated: ----- You shall, I trust, rest here with me a while, so that by our talking I may learn the English intonation. And I would that you tell me when I make error, even of the smallest, in my speaking. I am sorry that I had to be away so long today, but you will, I know forgive one who has so many important affairs in hand.
Words that are considered to have primarily a literary usage are not necessarily also archaic. To me, an archaic word or usage is one that is not used anymore. Of the words you listed in your post, I would consider only ere and even/eventide to be archaic. The others are still alive and kicking.