There is one equivalent, and everyone is going to hate me suggesting it: call me. Pick up the phone and call me.
Yeah, Gen Zers, I said it. Use your telephone to send me an alert that says you want to speak to me with your voice. If I have time to chat, I'll answer. If not, leave me a store-and-forward recorded offline message, aka voicemail. If I have time I'll listen to it and call you back.
This is inferior to the pop-in for the interrupter, but superior for the interruptee. It gives us back control of whether we are interrupted (put your phone on silent if you really need to), it is universal and ubiquitous.
Obviously, because of phone spam, this doesn't work with normal telephones (unless you add all your coworkers to your contacts). But Slack/MS Teams/Discord/VoIP/etc can solve that for us. Just tell everyone in your office to call you, and leave a message if you're not there and you will get back to them as soon as you can. Put "Call Me" as your away message. Voice calls worked well enough for nearly a century as a remote working method; I think we can learn to do it again.