The plain Horsehage stuff (Rye) is great for goats, if a bit pricey. I have used it, and if you only have a couple of goats I would spread it out in adry place (we used the polytunnel)) to dry it off a bit more.
The main reason for not feeding haylage is the greater risk for goats wrt listeriosis, which they tend to get easier than sheep and only rarely recover from after massive AB doses and often with ongoing problems. I guess however the Horsehage stuff is tested, and should be safe to use.
My goats also love freshly scythed grass (not when wet) and used up within a day/max 2 days- if packed in a bag (it will go hot after that and start to go off). We have also (in years with lean summer hay supplies) scythed grass (using the brush cutter atttachment on the strimmer, not the string) and spread it out in the polytunnel to dry off and fed over a few days - they go mad for it. Needs turning (like hay).
So rather than feeding crappy hay, a compromise bewteen (expensive) haylage and (free, except for your labour) grass should be possible over summer.
Plus loads of branches and other green.