Nema 34 face plate

I'd write it off and grab a new one, shouldn't be all that much....and you'll learn a lesson
Keep the busted one for testing, what worries me most, from the picture, is the damage to the top left side.
Are you sure it's a NEMA 34 and not a NEMA 23 ?

The Beagle's got brainz! it is a NEMA23!
www.motionking.com/show_products_detail.asp?ID=10&fenlei_ID=2

But its not your average cheap $20 chinese motor. Based on a recent quote for the same brand 100 mm long @ AUD $165, my guess is about AUD $140-$150

Yup that looks like a 23.
I do have one of those but it has different hole pattern, so it will not fit.
As you can see in the attached picture, i use them as bearing mounts for shafts, a lot, even dismantling some new 5 phase motors for the mounts. The one with the rotor still attached i can send you as it has the closest hole pattern to yours, might need to drill 2 of those holes as they are for an M3 screw.
Given the state the world is in, do not expect it any time soon, i have plenty of stuff i ordered that got lost and never made it here during this CCP thingy.
Please do check if the bearing OD is 22mm.

You could try with liquit metal. Just takes long to get realy hard. Or some other 2 component stuff.

Funny how no one suggested make a new one

BeagleBrainz wrote: Funny how no one suggested make a new one

Very tight tolerances, so it's good no one suggested it!
Not a hobby project for sure.