Hi coffeecanuck and welcome to CoffeeSnobs...
If the EM400 is like the EM410.... then it is basically a spice grinder (has rotating blades)..... and in that case it is the anchor to pull the EM5800 down to the bottom of the river - not the other way around.
Blade grinders wont make a grind of sufficient quality for any coffee machine.... so, yep, its a boat anchor! You need the best grinder you can afford (and that is more important than the coffee machine).
Good luck with your journey