I'm in the same boat as both of you. If it's of any help, I've made a big ol' table
here of all the Bartender alternatives I've found so far, with the "extra bar support" column being the feature we're wanting. Though I'm not quite willing to switch to the alternatives I've found so far.
I'm tempted to stick with Bartender 5.0.48 (from SetApp) until the BetterTouchTool author finishes adding "hidden icon showing" features in the next few days. He's already added a "Move Menubar Status Item To New Position" to v4.577-alpha where you can kinda fake some extra-bar functionality by moving around your menu items in response to an action.
It's a little unclear. 5.0.49 is the last one signed by the original dev's certificate as Surtees Studios Limited, but it seems like the sale likely went through a couple months ago, so it's possible they were just using his certificate to sign versions they now controlled. Or if you want any of the newer bug fixes urgently, the new devs say Test Build 5.0.53 removes the Amplitude analytics at least.