There is NO exemption.
For the second time in as many days I'll say once again. "Sometimes the less said, the better." If you tell them, they are then obligated to apply the rules as written. If I were in your shoes, and I knew I was going to return long before the two years of C51 were up, that's a chance I would likely take. Now I can only speak for myself, but I wouldn't be advertising my plans to distant friends, the CIC, etc. The CIC will likely only come sniffing around if there's a complaint or the CIC officer had some doubts on your relationship right from the start.