The gamechanger fits if you use a bipod that takes minimal space like an Atlas. True you can't add a spigot, but an ARCA rail can be adapted with minimal work.
I have two Howa-inlet 180-Xray chassis, which have the same exact forend design as the 180-Alpha
I have the CZ455 chassis, which uses the same plastic clamshell forend as the savage chassis.
There's 10 inches from the front of the mag well to the tip of the forearm. That's the same as the length of a full sized OG gamechanger (and only about an inch longer than the first model AG Gamechanger, Mini Fortune Cookie, Solo Sack, etc.), so even using an Atlas over something like a Harris, there's still potential for issues with the rifle sitting neatly on the bag without interference (and you're letting the chassis force you to choose a more expensive bipod).
You could choose a shorter bag, like a pint-sized GC (7" long), but again, you're letting the outdated chassis design dictate your other equipment choices.
So, you're either limited in your choice of bipod and bag (and still maybe stuck with some interference), or forced to adapt an aftermarket arca rail to overcome the outdated forend. And unless you can find a way to adapt a barricade stop to the chassis (or use the Area419 stop that clamps to the arca rail you've had to modify to fit the chassis), there's nothing to prevent a bag putting rearward pressure on the magazine.
Lastly, since the metal backbone stops under the Savage barrel nut, the forearm is also considerably less stiff when compared to other KRG chassis, or to competitors options.
Either way you're stuck with having to work around a shortcoming of the chassis.
An MDT LSS-XL with the aluminum skeleton rifle stock is within $30 of the 180-Alpha, has the same buttstock adjustability as the KRG, plus 13 inches of forend (enough for a bag plus any bipod option), and has M-lok so that you can easily add Arca, weight kits, etc.
The 180-Alpha is a great chassis, but at this point there are much better PRS specific options for the Savage.