Since I have no ideas on what cats could get into that other animals could not get into I am going to throw in a different type of suggestion;

Recruit some trust-worthy volunteers. This is how our shelter gets its cats cared for. A network of volunteers who take a shift (am and pm shifts in our case) to go to the shelter and do the feeding and the cleaning.


All you would need is one or more people willing to take a day to do the feeding chore at the appropriate time.