The only 2 mulchers for mini exs are Bauma light and torrent.
Flails will work if you are not trying to turn it into a mulcher for trees. It is not designed for that. It is deisgned for heavy undergrowth and very small trees. Rotary is the cheapest and takes the least GPM to cut but the cut is the roughest. Flail is next but takes more GPM less productive but better cut. Mulcher takes the most GPM has a good cut and will mulch.
AFE does make a unit that will fit a 5-6ton excavator but I doubt you could manage it on a 35 size machine.