Hey mate,
I make a fair bit of boerewors at a go - usually around the 25kg mark at a lash.
I gave my wife a Kenwood mixer as a gift (yeah romantic deep down....now stay in the kitchen
)
years ago and I use the mincer attachment on this. It is grunty enough to mince up the meat in a coarse grind and just put the attachment for the sausage stuffer.
Works nicely and never had a problem.
You are right in the blocking up though - drives you fekking nuts at times.
This model does not have the reverser......don't know you get one with that function.
Hopefully this might be a bit of help.
I'd be inclined to ask at the butchers what they use.
They do truckloads of the stuff.
Good luck mate.
"Only when the last tree has died, the last river has been poisoned and the last fish has been caught,will we realize that we cannot eat money" - 19th Century Indian Creed