One method used is to install a 'reverser box' that is driven from the rear
PTO along with a long supported shaft that is 'slung' inder the tractor.
I have seen a few home made units of this type in my area.
Also BERVAC had a factory made one.
My blower incorporated the Bervac unit, however I opted for rear usage for a number of reasons, mainly I wished to keep
FEL usage as well as I have a front plow.
Yes I'll sell the reverser! PM me if interested.