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One could use an argument much like this to argue for compelling other self-incriminating testimony.

There's nothing to argue - you definitely can be compelled to provide self-incriminating evidence including blood samples; the fifth amendment exemption is solely about actual testimony.

Right: you can be compelled to give blood, for example. But the fourth should apply.

That being said, we probably don't have too much time before we have to distinguish between the notions of 1) being compelled to testify and 2) having one's own account being taken without the need to actively testify.

I believe that they are fully distinguished already; taking over your accounts without the need to actively testify seems comparable to taking the contents of your safe or contents of your private correspondence or contents of your storage box at someone else's place - clearly permissible if (but only if) there's a warrant for that.

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