So under my scenario we would still play PKs in every game -- 3 points for a regulation win, 2 points for a SOW, 1 point for a tie/SOL, 0 pts for a regulation loss.
Under this scenario, we are currently on 4 points, Charlotte is on 2 points. If Game 3 is tied after regulation under my scenario, we wouldn't need to go to penalties; NYCFC will already have 5 points and won the series. If Charlotte wins in regulation, they win the series.
The main reason they would never go to this system is it's too confusing for casuals; it would take too much education to make fans understand it. But there would still be a chance to end the series after 2 games (even a regulation win & SO win would do it), and there would even be a chance that we wouldn't need penalties in a decisive Game 3. Obviously a team only needing a tie to advance could lead to a boring Game 3, but teams already play for penalties now so I don't think that would look too different.
I really do think the Race to 5 would work in this round and be a more equitable formula than what we have now, where NYCFC could go undefeated in the series and still lose the series.