Two Phones, two Apple IDs to Dual Sim

I’ve seen this asked before but a lot of comments seem to be from a while ago.

i have two phones each with there own Apple ID. one is for personal use, paired with a watch. the 2nd is for business use, with that Apple ID used on an iPad as well. I have a desktop and a laptop that have separate logins for personal and business.

Im getting tired of carrying two phones around. And want to transfer by business line to my personal iPhone.

Will the iMessages sent from my personal phone(logged in using my personal Apple ID) from my business line still make it to my iPad?

I still want to use the iPad exclusively for business use and want to ensure the texts will still arrive there.

Has Focus been expanded to be able to turn off a particular line when a focus is turned on?