You have a different definition of easy than I do! You have to figure out which of those your client was using at the time, and then how to convert it into a currently functional client’s private key format. Most people need to hire a specialist to figure that out.

There are standards for seed phrase generation and the big providers mostly use the same one called BIP-39 I think. That's why they advise writing the standard and wallet and some other info down with the seed phrase, a layperson likely won't