The OSC to 226.20(b) Assumptions, states:
5. Status of parties. Section 226.20(b) applies only if the previous debtor was a consumer and the obligation is assumed by another consumer. It does not apply, for example, when an individual takes over the obligation of a corporation.
It doesn't sound like what you are describing would be subject to Reg. Z.
As far as whether it can be done, I don't know of any reason it couldn't be, but you need to check state law as well.
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Opinions are mine and not necessarily my employer's.