I figured you guys had already discussed this, and I totally see how it would be difficult to fit in. Having the date in binary I think would be a good plan, with Gridcoin having 8 letters, you could have it fit twice around the coin (just the year) or once (year, month, date). I think that would be a lot more important than having the word Gridcoin twice on a side, especially for a one-of-a-kind commemorative coin.

Sorry if I seem like I'm not minding my own business! I'm adding my 2 cents because I think the work done here is impressive. Even if the context of their creation wast lost, these coins would be pretty objects on their own.