>They have to prove you committed a crime, all you need to do is have a lawyer present during questioning.

That's a good idea, but any decent lawyer will tell you to keep your mouth shut. Especially when being questioned. Let the lawyer do the talking[0].

[0] That assumes you have a good lawyer. Which may or may not be a valid assumption.

That’s already stressful and expensive but consider also that you’re probably only having that conversation if they already have evidence for at least one crime (disclosure and/or taxes). That is likely going to be grounds for a search warrant to examine everything else, and even if that’s ultimately fruitless it’d be an ordeal and could lead to professional consequences as well as things like losing your devices to a forensic lab.