I like the idea of putting the clothes away folded inside-out. I will also ask her about it.
Wait - I'm puzzled as to why you're going to ask her? She's going to refuse, of course. When the idea is to set boundaries with her, you can't ask her permission to set those boundaries.
I'm thinking he means asking about the added step in general, as that was another of the suggestions.
That being said....I'd avoid any discussion about the particular details of this new added step, and talk about it, if you wish to talk about it, solely in terms of the generalized subject of adding extra steps to things. If only to chip away somewhere somehow through the defenses, to plant a seed about complicating things. Any discussion of the details here will lead you into the fog of arguing and explaining, which will only frustrate you and entrench her further, in all likelihood.
To be clear - a discussion here about the particulars of turning inside out can only take place inside the OCPD construct as that's where it was created. A discussion* about complicating things, on the other hand, is staying outside of the construct and attempting to engage on that level. You may not be successful in the least, but it accomplishes two things - not engaging the OCPD, and possibly planting that seed to be reinforced by you or others down the line. Seeds can get planted.
*edited to add - actually, I'd try to steer clear of discussion in this regard, unless she's somehow open to discussing complicating things, and keep it to a simple statement about the concept, to lessen the likelihood of getting engaged in an argument about the folding. This can seem odd and can seem like it would veer into being patronizing - but really all you're attempting to do is stay out of that arena entirely. Think about it like walking up to a fenced off area where some chaos is happening, and simply observing it, calling it what it is, then stepping away. Rather than actually stepping into the area, where all bets are off and you're in there on their terms.