I think a sideboard could work. But, I think you'd need to do something like have 3 prebuilt sideboard decks. You name them something you can remember like vs. control, vs. combo, vs. aggro.
Then between games you can pick one of your 3 prebuilt decks to choose from. The rope starts burning on your decision as soon as the deck options pop up. The idea is to have almost zero time spent waiting for sideboarding to take place.
The issue is that on ladder, you are not playing against the same person over and over and classes will vary as well. So you have little if any knowledge about the other deck and which counters to pick.
Sure, you could say "well, everything is a net deck, so you know what kind of deck it is" and true, that would be the case to some degree - but then the net decks also have the option to sideboard and counter your counter attempt. Then you are back at square one and your best bet is to play the standard version with the most consistency instead of the 10% auto-win, 90% uphill both ways version.