You ought to be able to source a replacement B-screw from your local hardware store if they carry the Hillman line of fasteners.

Bigger issue is cutting the bent screw off BEFORE you try to remove it so as to avoid bunging up the threads on your new acquisition's aluminum housing body,

I have a 'spare" VG-T Luxe I'll take a look at in the morning, see if I cant't give you an idea of what the metric fastener specs are for that part.

On the VG-T Luxe I mounted on my '72 Motobecane GR I had to go to an M5 B-screw before it would align properly with the B-Screw boss on the Campy dropout. Otherwise what I think was an M4 would only catch about 1/4 of that lug.

Recollection has the original as an M5 - 0.50 where I instead re-tapped for an M6 - 1.0 stainless cap screw. There's plenty of metal on the boss holding the B-Screw's threads for this, at least on my two examples....