I haven't read all the comics, novels, graphic novels, teen books, kid's books, etc to know all the details, but the Jedi purge was not complete. We know at least that Quinlan Vos survived and even had kids, and how many Knights and Padawans were away from the temple on one-off missions, not all of which would have required clone escorts? Given any warning at all, any of the Jedi could use mind manipulation on the clones that later showed up to find them and lived comfortably for a long while, especially in the outer rim.
I would also assume that Jedi would be able to live relatively normal lives free of suspicion if they suppress their use of lightsabers and use them only in situations where they know there will be no witnesses or people willing to turn them in. You can fight in normal clothing using mental manipulation, force pushing, and other techniques without drawing attention on holovids by wearing voluminous robes and waving around a burning blade.
I do have a few of the graphic novels, and recall some of them explicitly showing Jedi going to the temple and seeing hopeless odds, so they melted back into the crowds of Coruscant. Perhaps the order still has pockets of relatively minor devotees in loose affiliation with each other, or maybe they all went separate ways and severed communication. The only ones we really see die in RotS are the masters on the council; it's implied that all the Jedi had their clone escorts turn on them.
Back to the topic: Rebels. It's not inconceivable that Kanan and Ezra, knowing the draw that Force users exude on other Force users, would use mind manipulation to erase memories of their rebel friends and retreat to a remote location away from the Galactic Civil War to help their friends evade detection. Maybe after the Battle of Scarif, the Ghost crew went to help Sabine take control of Mandalore and use that army's might to help free another sector of the galaxy, but the Emporer and Vader were so obsessed with Skywalker that they didn't spare a thought to that conflict. Wouldn't that be a fun adventure: Sabine and Mandalore in league with our rebel crew trying to stage an uprising in a large area to which Thrawn has been dispatched. Thrawn's capacity for strategy and analysis vs. Mandalorian ferocity? Yes, please.