How would you repair that broken casting ?

It's been pretty slow on that forum lately, so I thought I'd throw some food for thoughts.
Not sure this is the best place for posting. Could have been on the machine reconditionning forum as well, but since it's a deckel casting (from a T&C grinder though), I thought I'd begin here.

So here we are : I had the opportunity to get a Deckel S11 index head in a trade a few monthes ago.
Those heads are pretty rare and the reason why I was able to get it is it was broken.

Below are a few pics of the disaster, the last one beeing a view of the whole deal as it looks like when in good condition and mounted on the machine.



As you can see on the pictures the broken part is on the index head itself, the support beeing intact.
The problem is that the walls on the T-slot are really pretty thin so there's almost no meat.

I'm pretty set on the general concept of the repair I'll do, but just for the sake of not missing other options, I'd like to know about other's opinion.

I know the most straightforward repair would be to get rid of the complete T-slot and make another one in a separate part that would bolt on the freshly dressed index head casting,... BUT the external part of the ring with the angles engravings is more or less intact, so that even in its current state, the broken part is invisible when the index head is mated to its support.

For that reason and in order to preserve the original look of the head as much as possible, I'd like not to be obliged to shave that part.

Thoughts ? ;)

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