Sync imessage and iphone WITHOUT icloud
For safety reasons on a Family Plan, I need to sync imessage and iphone just between my own Iphone 14 Pro and MacBook Air M2 without connecting to icloud so that my messages/texts cannot be read by anyone but me, especially not the plan owner on the iCloud plan.
How do I do this? It was working before, as I turned off iCloud awhile ago, and suddenly stopped working. Please provide step-by-step instructions, clear and simple. Thank you.