Freeze plug
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Freeze plug
Freeze plug and some rtv
Freeze plug would be simple.
If you have the old sensors, using those once modified would work.
JB Weld?
Bottle cap, RTV?
get a couple cup plugs ("FREEZE PLUG") of the required size
That is not the guts of the CVJ, that is a pressed on ABS sensor ring. That is the stem side of the out board joint which has a sealed cup with a stem. The other (boot) side houses the guts, cassette, balls and inner races for the joint.
You can leave it open or cover it, performance will not be impacted either way.