[fngMalvos]

I find a fast way to switch weapons is (if you have a browser that uses Tabs, and most do) either CTRL-click the "Unequip" button or middle click it which will open a new tab, but on the same page you can then just click "Equip" on the second weapon and just close the tab. Only every without a weapon for a split-second.

Of course if you're on a phone I guess you're SOL.