Smart thinking on your part!
I find it helps to know the guys and their friends.
When my guy's Iphone 14 broke down in July, he used his friend's Line account to contact me! His friend has my Line because ... hehehe!
Same thing happened recently in December when his new Iphone 15 suddenly shut down and needed software update at Apple Store. My guy got another friend to video him explaining what happened and this other friend sent video to me. And of course, I have his Line because ... hehehe!