I have something like that and haven't found the right place to splice into the heater hose to defeat the heater valve and yet not defeat the normal heater operation.
BTW, contrary to common belief, most of those 'cidculating' types work on convection and require placement so that coolant exits the engine through the bottom, goes though the EBH and goes back in somewhere near the top of the engine.
Since we're talking about convection anyway, I'm also looking at the lower-radiator-hose type. Problem is, both hoses enter the block at the same vertical height:
I'm not sure convection would work.
Of course, I can't actually see any of this with my eyes, there's so much crammed in there.