reminder sms: can't exclude an appointment type

When sending sms reminders you can filter by individual appointment type but you can't exclude an appointment type, which is what we'd like to do. We are a physio clinic and have 8 appointment types. We would like to send a reminder to all but 1 of these types (our exercises classes - which are at the same time every week). Currently the only way to do this is to filter by appointment type 7 times and send out to 7 separate groups & NOT send to group we don't want. If there was a tick box next to each appointment type & you could choose which you wanted to send to this would be extremely helpful.