I'm in the same boat with e57
I once bought and ran a 4' piece of flex duct from a bath fan as a favor to a customer that wanted an inspection right away.
The inspector turned it down...No convoluted duct allowed in the County.
Of course I became the "reason" that he didn't get his inspection.
I'm an electrician, so I leave the other work to others. I don't want to see a picture my work on some Plumbers Forum labelled as "hack" work.

Don't forget that No Good Deed Goes Unpunished