I think , but am not sure that the 1.35m mower you mention is designed for a compact tractor, hence you need to check it will stick out of the side of your tractor when in th mowing position, otherwise you will be running over the grass you are about to cut.
Would go for hay bob rather than wuffler ......wuffler is 50s technology, haybob is 70s technology and still sold new today.
No experience of your little balers, they look great, but many people post warnings about Chinese compact tractors. For the money you could buy a real good conventional baler and put a field shelter up just high enough to back it under, a few tall fence posts, and sheets of tin is all you need......might be better in the long term........I do like the look of those little balers though !