I have always thought that these "mutant" clones which are unable to be mericloned reliably are actually chimeras with two cell lineages with differing anthocyanin production existing within one plant.
There are some vague facebook posts from the nursery which produced a couple of these mutant RLC. Hey Song clones showing color bands extending up from the meristem of a new shoot all the way to the top of the leaf. They indicated that is a sign the flower produced from a particular growth will have the desired color pattern.
Furthermore some nurseries which have grown flasks of these clones to maturity have pictures of the resulting flowers - most solid color - and each presenting the exact shade of either the orange, yellow, or red portion of the mutant flower.
It is possible this effect is viral - though not cymmv, or orsv. It should be fairly easy to test that hypothesis by "grafting" a piece of one of these broken color clones into a solid color cattleya and see if the effect spreads. This used to be done purposefully to create "broken" tulips.
for reference:
Chimera (genetics) - Wikipedia
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