I don't think HD can vent like this due to the EPA. Neither through the oil filler or the AC like some do.
On my roadie I have done both venting types. AC and dipstick. 13K miles, stage III, no sumping.
On batfoy, I have only vented the AC. Would like to vent dipstick eventually.

 

Ah yes. Good point. The EPA

I visited A1Cycles page and they seem to only have screw in dipsticks. My FB has the camlock type, no true threads.

 

That’s why I only have it for my roadie.

Unless $$$ is no object then you can get one here.
https://www.feulingparts.com/sku/3086

 

I have had no oil in the vent hose as it is pitched up hill. As far as expoxy, the dipstick is two pieces that have little snap tabs, as that is the way its put together from the factory. I used epoxy to seal the bottom half to the top half as to not have air/oil leak after drilling through it. I have already vented the air cleaner to the atmosphere, but never got alot of spooge out of it anyway. A drip here and there. I ran that along the frame rail and used a cable clamp to secure the end.


A/c venting

 

That's pretty spendy, though I'd probably go for it if I knew for sure it would stop the oil migration through the breathers.
The A1 video with the Fat Boy seemed to intimate that they would be selling their kit for the M8 Softails, but they're not to be found on their site.

 

Jake, thanks for the pics. And the clarification on the dipstick cap.

Did you vent the AC to atmosphere before you added the venting on the dipstick? You sure did a fine job on both!

 

I enjoy checking out what you folks do with your bikes, But I'm glad my 2018 Road Glide Special has been running great for over 46,000 miles without any gizmos.

 

Yeah, They are hilarious.

Let see.. If you add a vent at the oil tank will less air flow out of the heads?? Need Jeopardy music..

 

Yes, the day i installed the air cleaner I drilled and tapped it to make way for the hose barbs, Plugged the breather holes in the filter housing with hi-temp rtv.

 

Thinking of venting the same way. Do you think routeing the hose away from the back tire would be a better option? I am worried about any oil coming out near the back tire. Or is it such a minimal amount not to worry about.