Your changes to the diagram look correct. The modified tone will give a vintage 50’s style control, just make sure the capacitor connects between the lug and the back of the pot (can’t see the back of the pot connection on your diagram). The key element of the 50’s style layout is that the tone link connects to the middle (output) lug of the volume pot.
The 500K vs 250K volume pot is always a compromise when you’re mixing a humbucker with single coil. The humbucker should sound better with the 500K pot, and I think particularly for the bridge + neck series setting on the 4-way. You can compromise and try to get a lower spec 500K pot with a value closer to 400K, or permanently add a resistor across it to give you a custom value but that alters the taper of the pot. I’d stick with the 500K volume pot at first and see how it sounds across all the different pickup combinations, as you can always roll off some tone if it’s too bright but you can’t passively add treble if a sound is too dark from a 250K pot.
Your question “necessary to put a resistance of 470” I assume is about adding a switched resistor across the pot for the bridge position so it has an effective 250K value? Unfortunately, with the way the 4-way switch is wired to give the series position you can’t add a resistor that is only connected in the bridge position, it would have to be in the circuit for all combinations with the bridge pickup. As stated above, I’d stick with the 500K initially and then decide later. You can always temporarily clip/connect a 500K resistor across the volume pot to see how it would sound if it was 250K.
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