I've bookmarked this as I might come back to it...it's the kind of thing that would normally appeal to me, so I might give it a go.
That line though: 'not your keys, not your crypto', that's off-putting - given that I should really do more about getting some of my crypto off the exchanges first!
well, if you have them on an exchange you might as well put them on celsius.
but if not, get yourself a hard wallet at least.
here is the link from my site if you do want to get one
https://cryptogoodies.com/hardware-wallets-keep-cryptocurrency-safe/