Anyway, I wanted to send them a little mix of my own coins...
From personal experience, I can tell you that it is mostly a bad idea, because most people have a hard time understanding Bitcoin, and when you add altcoins to it, you will only cause even more confusion. I would personally focus on Bitcoin and probably the most used desktop wallet Electrum, with the fact that maybe after sending the transaction, I would recommend that instead of a hot wallet, they only have a watch-only wallet on their computer or smartphone.
However it turns out in the end, it is important that they understand what you are giving away, what is the meaning of everything and what are the risks. Otherwise, it may happen that all your efforts will be in vain.