Should I force an 130 mm hub into my old vintage alu frame
First, try to find a modern wheel that's the right size. They are still made and you can get very shiny ones that will match the bike very nicely. Or get a 120mm fixie hub and add 3mm of spacers each side.

If you must use a modern wheel, try to shrink your hub. Many hubs have washers between the locknuts and cones, or other spacers. If you can remove even a couple of washers to bring the hub width down you're better off. Ideally keep the hub symmetric, but a millimetre out is not the end of the world. Note that you'll need cone spanners and a little skill to adjust things after you do this. With a modern sealed bearing hub it's easier, but with a classic bike like that I suspect you're not putting new wheels in it.

Finally, spreading the frame 4mm should be fine. It'll make getting the rear wheel in harder. With aluminium, do not try to cold set the frame. Once the aluminium yields a lot of the strength is gone and you've basically destroyed the frame.