You could rake, tedd and mow with a 4105 - without too much difficulty. Of course, you could also run an older, small square baler with the 32+ hp @ pto as well.
The 2-range eHydro would not be nearly as efficient as the 3-range eHydro on the 4x20 series tractors, though. I'm afraid that you would be working the tractor in low range for virtually all the time - even raking and tedding.
No guess on the long term durability of the 4105 for haying, though. You might find that the 3-cylinder, 91c.i. engine would be struggling to maintain through-put with the baler and to some extent even with a small, disc mower in heavy hay.
There has also been some mention of the smaller framed tractors with the eHydro tranny going into "relief" with a baler in heavy hay/alfalfa by owner's here on TBN.
I used my JD110 (33hp @ pto) for one season's haying. It did all the work... mowing, tedding, raking and running a JD 336 square baler. Very capably managed all the work except the baler. It did in fact, "manage" the baler but it was on the edge and I would not choose to do that on a long-term basis!
AKfish