Update at 109K miles.

Popped off charge line to look inside throttle body.
Saw about 1/3 teaspoon puddle of oil sitting in front of throttle body. A bit surprised.

Opened ProVent and observed the filter fully soaked in oil.

I thought: "good that it is catching oil, bad that it is soaked and thus not catching enough?"

Didn't have much time for looking more on Sunday morning.

Need to inspect the ProVent outlet hose. Last time I looked at it, it was slightly moist but clear.

Since the filters are available for purchase, I wonder if it wouldn't be prudent to replace it periodically, rather than just rinse it with solvent.

@ZetaTre,

When I made comments about trying to offer the plate, I did not realize you had already started a thread gaging interest. If you are still pursuing that, I will gladly cease and desist with my offers.

Yes, they are replaceable and should be. I guess I didn't expect one to become soaked and thus less efficient so soon.
Will wash with solvent tonight and keep monitoring closely.
At $50 a piece, having to install new one every 2 months is a bit much :)

I tried to message him about the plate one time and he didn't reply back. So I guess he didn't push through with the project or only made a few plates.

But in case you will have one built, make it two I will buy the other one

Ok. I need to order in the pent-screw bits so I can take it off safely. Then I need to get drawings made and send them to my guy to quote.

Am I to understand that these pieces:

RealOEM.com - Online BMW Parts Catalog

cannot be reinstalled after this mod? Or do they require modification themselves to fit?

Modification to item 6 only I believe.

You can count me in for a plate as well. Someone should just make a full kit available.

That becomes a rather large outlay to only sell a small handful of kits.