Unless it has changed in V2P2 became Part A, the current policy is time based: If you need more than 1.5 hours to get to work, you're supposed to do something to obtain suitable accommodations closer to your base and get proper rest.
As for roster disruptions, REPEAT: They can only disrupt your roster if you answer the phone (if you were silly enough to give them your mobile phone number rather than another phone that is OFF except R days) or if you accept/acknowledge the change online. Print your roster on the 15th and show up for that, and just like magic, your roster won't be disrupted...someone else's will be. (Down route disruptions are another can of worms, but see below for a partial fix.)
A slip of paper under your door at a hotel room (or 10 slips, as per freighter roster changes in ANC) which you may or may not see (since you may or may not be staying/sleeping there) does not count either. If you present yourself at dispatch or the hotel lobby as per your current roster, your duty period has just begun...just let CC know you're on duty and let them sort out what to do with you then. Odds are you will end up with a short "fake" reserve and then the day off (before they have to pay you any meal allowance, see Part A).