Oh, right you have that in post 1. I was thinking the main scenario we were worried about was the possibility that if you used an SDFP on a non-entered band that you'd risk getting shut down on the SDFP account and possibly on your main MDE account if linked.
The good news about possible locking of ticketed but not park-entered bands that made advance fastpasses is that it won't ruin your day, right? So long as you are using make believe MDE accounts, the worst that could happen is that your second account with an unused ticket on it will get locked. You'll still get your 3 fps on your main ticket and the ability to make SDFPs in the usual way on that band. Now, if Disney doesn't ultimately let you unlock the account that would be very bad. But I bet that won't happen for a few innocent mistakes.
What would be really devious is if Disney were to let you use a ticketed band with advance reservation FPs on it for FP but then deduct a ticket entitlement.