I don't have capital gains to declare, so my return was not blocked by a locked Schedule 3, only by a locked TP-726.6 form.
Today, I downloaded the new version of TurboTax and I was able to submit my return by Netfile to the CRA and Rev Que.
And my TP-926.6 was also included in my saved PDF copy, so I consider that 100% of my return remained intact without anyone having fudged it as an unofficial workaround.
I will be back next year.
