However we now mainly just run the normal 5 minute sequence. We frequently have multiple classes on any given sequence. There are only three of us on the boat. I can have 2 flags in one hand to signal the start while having two flags in the other hand for the next starters. It is fun, no big deal, so my advise is stop fighting it and just get on with it.
People learn real quickly, both on yachts and committee boats.
Now the eligibility rule is another issue altogether. Learning white, blue, red as 'we be racing' was easy to explain to newbies. It is a rating rule with each boat's TCC calculated by a set of objective maths using her rated data. There are no 'tables for an initiation guess'. No rating system can ever be perfect.