I don’t know of a tool that you can do that.. (without being blocked, banned, or someting) at least, those tools that are somehow Meta’s “official partners”  . following your post here to see if someone has any information.

Hello ManyChat Family 

From: TheNerdNextDoor 

Here’s what I’ve implemented,  best alternative would be using a IG broadcast Channel it kinda functions in the same way as broadcast for manychat being able to allow those who want to be contacted by you to opt-in, direct from your IG bio.

How To Use Manychat to get to them to the IG Broadcast channel? :

You could create an automation in manychat and in the automation give the link to your IG Broadcast Channel - this way you can at least attempt to message them AFTER the 24hr window. This is also a great way to have all your people in the same place and bridge them into your offers - it also calls attention to your channel and curiosity of strangers who are not OPTIN yet to view your channel see what going on …. I put a link to Instagram to explain more about IG CHANNELS 

Hopefully this helps you guys and gals! 

P.S I used it and grew 118 optins on my IG channel in 10 days so it works!