Cheers!
Another idea for your consideration: the "giant orcs" that Nick Lund did for Grenadier are still readily available from
Forlorn Hope (in the UK) and Mirliton (in Italy). They're pretty hefty - I use them as ogres in 28mm and 1/72 - and would probably make good squat, brutish orcs in 40mm. There are only eight of them (I'm including the one labelled "battleleader" in the Forlorn Hope listings along with the seven that are identified as "giant"), but that would still give you a decent skirmish-sized warband.
The photo below shows them on 40mm bases with a (tall) 1/72 figure for comparison. As you can see, the biggest guy's about 40mm tall and the others are maybe 35mm - but hunched, squat and broad with it. They would fit on 25mm squares:

You could also mix in some of the Forlorn Hope/Mirliton/Grenadier ogres and trolls as orcs (I mix them all in as ogres) - the guy on the right here is a Forlorn Hope ogre who'd make a decent orc champion in 40mm:

Also, here's a shot of the Reaper Bones bugbears. These are based on 50mm squares (to be used as snow trolls in Kings of War and some kind of giant humanoid in Oathmark), so they're significantly bigger than the Nick Lund giant orcs and ogres:

If you wanted D&D-style hobgoblins in 40mm, I think these would be the go-to option:
