Hope will (or at least used to) make them in whatever size you need for aftermarket upgrades of other brakes, either ring them up or ask in a local dealer.
IME as long as the addapter and disk match then you should be OK. E.g. I've had hope callipers and avid disks before and they worked fine with an avid addapter (but not with a hope). So you may be Ok if you swap to hope addapters.
Or just try it, as long as the disk covers the whole pad (so that it wears evenly not leaving a step in the pad)) and doesn't jam in the calliper or the pads foul the rivets on the disk it'll be fine.
Or get some Shimano floating rotors and some blue spray paint. Some carefull masking and a metalic blue rattle can of paint and you should be fine as the alumninium carrier doesn't get hot.