I also found that calling AXIsProcessTrustedWithOptions which asks for Accessibility permissions will get you Accessibility permissions, and you'll be able to create your CGEventTap without Input Monitoring being requested (because Input Monitoring is part of Accessibility permissions). If you just want/need Input Monitoring permissions, create the CGEventTap, which will prompt the user to give the permissions and restart your app, then when you try to create your CGEventTap again, it won't prompt and you'll get your tap.
skucas
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I have no idea what Apple's going to do in the future, but it seems that accessibility permissions encompass the input monitoring permissions (which makes sense).