Of course, the ideal solution is to bag two Thanagarians with one stone and do it as a [insert polite term for “rip-off”, if one exists, which it doesn’t] of the Doctor Who episode “Last Christmas”, where characters from different time periods and realities are placed in the same artificial reality and interact with each other. This way, we get to see the… Things… that might go on inside all of their minds - like Tim and Conner maybe being a couple? - and also involve alternate Robins like Carrie Kelley and Helena Wayne. They could even revive the Silver Age concept that Bruce Wayne was Robin when he was a kid, and have his younger self interact with his successors. And, as much as I hate to quote the former guy, in his words, “unrelated, but still related,” maybe Barbatos is the one behind this, and he thinks being the bat that flew through the window means he was Bruce’s first sidekick, before he even became a hero.