Cedric was dx'd on Good Friday last year. 2 weeks later I was scheduled to go to Colorado for 3 days (sister's college graduation) and then return for a 4 day "stay-cation" at one of the hotels at Walt Disney World with some friends (I work there p/t). he was scheduled to stay at Best Friends Pet Resort on property the entire time, but because of his diabetes they would not give him his Lantus, etc. So I was "forced" to board him at the vet's office. Boarding cost was the same, but I elected to have his dental done while he was there, so I believe they did not give him insulin twice because of that (save me the $27 a pop in testing costs). The negative was that I took him in Wednesday pm and couldn't pikc him up until Monday am (I came home Saturday, but they wouldn't let me pick him up when they were closed on Sunday - he still got care though). I moved him to Best Friends on Monday where I would go twice a day to test and inject Lantus.
Bottom line is that I was under a crunch and had to board him there. I ceratinly trusted them to take care of him, but I couldn't send him anywhere else - the other kennel I used also refused to give insulin (or test). I was "stuck." As much of a pain it might be to you to perhaps try this way, it might be your best option. Your pocketbook might not think so, since you have more than one cat....Since I rescued Dallas, I have hired a vet tech to pet sit for me (we are trying it out next month for another "stay-cation" at WDW). It will cost me more to have her come to the house twice a day than if I boarded them somewhere but they will have the run of their home and Dallas is similar to your cat - runs from everyone. Although he never stopped eating! Good luck!