Haha nice! That's a lot better than I got. Here's the response I got from Works Components (workscomponents.co.uk), which seems to align with what you heard from Commencal:
"If the headtube is the same as shown in the attached image then it would be a 56/56 size and something we can provide a headset to fit - I think there has been some mis-labelling of the type of headset used online which is causing confusion. It is possible that they use an IS headset within the headset cups and therefore call it an IS headset.
Using a tapered fork we would need to produce an upper headcup to suit (not a full custom item, just the correct offset to be used with a tapered lower) but that would be no problem and we will add it to our stock size as there are a number of manufacturers beginning to use this size now."
They can do 1 degree, can also likely do more. I'm going to ride it a bit more at the stock 65 degree angle for a bit before I decide, as it feels pretty good!
Also...I recently had Craig from Avalanche do the Super Deluxe shock and an open bath damper for the Lyrik up front. Made an awesome bike absolutely unbelievable.
That may contribute to why I don't feel like I need it to be slacker than 65 degrees, since the fork now stays much higher in the travel (while somehow feeling more plush).
The shock is also unbelievable. Feel softer in the parking lot test, but stays much higher in the travel and is much more composed coming off of jumps. Before, it felt like I either had to run the shock super soft to feel good in the rough, but it wouldn't feel composed coming off lips. Felt like I was blowing through travel off of the lip of jumps. And the stock "trail" mode felt like garbage, so I would just tweak air pressure depending on what I was mostly riding.
Craig tunes the Super Delux so you keep the switch, but actually have 3 ride-able modes. I ride the bike in the "trail" middle mode most of the time now for high speed jump trails. I run it wide open for steep gnar (e.g. doubleblack tech at Whistler), and really only use the "climb" mode for fireroads. The bike rides great in all three modes as the compression will still blow off if I take a big enough hit.
The shock mod is a bargain at around $250, I'd highly recommend it over getting a new shock! Just slightly more expensive than a service.