Shorter stem perhaps?
You’re gonna need one. I run a 50mm stem on my AMR which has about a 595mm tt. The Riot 48cm has a 610mm tt, which is about as long as I would personally like to go. Your other concern would be stand over clearance. The reason I can get away with a 48cm in the AMR+ is that it has a silly low bb height in real world terms. The riot seems to sit a bit higher. An offset bushing to drop the bb might be in order, but then you might be into issues with ghost’s needle bearing shock mounts. That’ll need changed to standard hardware.
I hmmm’d and ha’d about getting one, but the cost, coupled with may horrendous experience dealing with Ghost’s warranty system, and the fact that every carbon ghost I’d ever seen had cracked kind of put me off.