Hm please don't trust a service such as this over a decent legal firm, you can find always a reliable solicitor / legal support in your neighborhood.
One problem with "reliable solicitors" is that it's entirely possible for their firm to go out of business too, with few, if any, repercussions for the proprietors.
I'd prefer to trust something like a self-hosted Vaultwarden instance [1] with emergency access [2]. Maybe with redundancy even.