Roger
The offset funnel looks like a simple, cheap solution. However, before seeing your reply, I happened to be passing a Machine Mart so bought one of their flexible spouts.
It fits into the aerofiller a treat, but I've noted that the internal breather pipe is like a flattened tube, which is obviously to suit the MM jerrycan's wide internal breather, whereas the Aldi jerrycan has a circular tube inside. These different internals don't seem to impinge on one another but, equally, they don't marry up as such. Is this important? Seems to me it should still "breathe" so long as I don't just up-end the can.
Peter Burt