WOW WTG and a fellow Cubs collection at that to boot. Totally Awesome !! I am now due to 2 recent purchases Super Close to having at least one possible rainbow in my 2018 Topps Kris Bryant Highlights set. I.E. White , Blue , Black , Gold , Red , Auto , and Platinum. I haven't thought about the set like you have but I have thought about buying a few of those old time Cubs cards from that era.
Got my collection kind of split up in 3 places in two seperate states. So I am willing to trade but might take me a bit to find the cards from my Trade / Sell list. So please message me first so that I can take some time to find the cards you would be interested in. Whether it's an hour or 2 months or etc. I would get back to you after locating the card or cards.