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lahdelah-
would a 30t work on the aforementioned cassette?
That’s going to be a matter of try it and see if it clears the 30. They usually do, but the point Tester was making (let’s say you’ve got 52/42 at the front) is that the derailleur might not be able to accommodate the full range between 52/30 and 42/11. The cage simply might not have enough swing to do it, ie the chain will be too tight at 52/30 and the derailleur will be fully parked backwards at 42/11. You can only really find this out by trying.
Jonny69
On a 1× build you can probably get away with it, on a 2× you might run out of total capacity. There was a RD-1056-GS, but they're 30 years old now. If you want something which works well for not much money, get a RD-M310. If you want to keep your 90s road racer aesthetic, HTFU and keep using the 28 max sprocket