The last time that the Huish Outdoors Vice President for Marketing was in our store, I discussed the hose issue with him.
Since M1's are normally used for deco applications, the normal 32 inch hose does not work for many people who wrap the hose around their neck. I discussed putting a 40 inch hose on instead.
On the subject of atomic hoses, if you replace that standard length hose with something else you might want to get the same grade of hose particularly for technical diving. Many other readily available hoses do not have the same level of durability. One well known hose company actually uses screwed on fittings which we have had come apart in the middle of a dive.
While Atomic does not market shorter hoses, Huish does sell the same grade hose in many other lengths separately without the swivel. I suspect whoever manufactures the hoses also specifically labels the hoses for Atomic. Contact a Huish dealer and see if they will get one for you.
We use those for 24, 26, 28, 40, and 84 inch hoses..
If no one will help you, contact me.