I have only owned my B3200 with FEL and front mount Kubota snow blower for 1year. Last year was a joke for snow fall in Upstate NY. I saw picture of FEL and blower mount on at same time! Can you mount and use the FEL with the blower mount attached?
The 2620 does not have enough clearance to have both the sub frame and the FEL at the same time. However, with the 2620 I can switch out the sub frame (plow or blower) for the fel in a few minutes. I have a gravel/sand/rock drive so I use the blower set high to remove most of the snow and the change out for the plow to get down to the ground and if I need to use the fel I switch out for that. It's more seat time so that is no problem.
While I can leave the sub frame on the front of the sub frame quickly becomes kind of an issue. It doesn't interfere with the loader but it sticks out so while doing loader work you can't get anywhere near as close to a pile of snow or dirt. If you are using the FEL to pile snow it will dig into the pile. My suggestion is to get use to putting the sub frame on. My first time doing it was an hour or so but yesterday I did it for the 4th time and I bet it took 5 to 10 minutes at most.