Quote: Yes - ABSOLUTELY! I make cheese too so
whenever I have whey I soak like you're saying. Even just an overnight soak helps reduce the anti-nutrients in the grains making them more bio-available. If you could let them soak a little longer - all the better! And believe me, they LOVE it!
Since you have the whey several times a week, you could even start a large bucket or 2 with your feed and the whey and feed it on the second or 3rd day and just keep rotating so you always have some going. If you do that, just be sure the level of the whey stays above the feed about 1/2" or so to keep the feed under the liquid while it's soaking.
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As far as fermenting feed without the whey, a lot of us here are fermenting all feed and using a very simple system which great results. Depending on how large/small the flock is, some use very small containers all the way up to large "trash-can-size" containers to ferment various items including regular pellets, crumbles, whole grains, mash, etc. Once you get it started you just keep adding and taking away with each feeding time.
I use lacto-fermentation...here are a couple of articles (you may have already seen them - if so, you can disregard!) A 3-part article:
Part 1: Why Ferment
Part 2: Which Kind of Fermentation
Part 3: Simple "How-To"