You personally might recommend Bitkey for 250k (2.5BTC), but most self-custody advocates often recommend people store Bitcoin in the manner he described, especially when the general advice is to choose a setup that one would be comfortable with if Bitcoin does a 10X.
Geographically distributed collaborative multisig is very much what most people would recommend for an amount of Bitcoin that will be worth $2.5M in the not too so distant future.
