Add another style of tuplet bracket for Early Music coloration

Mensural notation used time signatures rather differently from today, and to insert a group of triplets into a line of duple notes they wrote the notes in red or black. In modern transcriptions these coloured notes are indicated with a short, broken bracket that is not available in the current bracket style. Using the usual bracket with the '3' looks messy, omitting the '3' gives an unbroken bracket which looks wrong, and '3' without the bracket may be overlooked if there are constant switches between duplets and triplets.

Here is an example from an instrumental piece by the renaissance composer John Baldwin:

The first bar uses the normal bracket throughout; the second has two brackets without the number, while the third and fourth brackets I created from the colouration start and end symbols from the master palette. Although I could (even should?) use a single pair of the coloration symbols for the whole passage this might be too confusing for a lot of modern players; hence my request for a compromise which looks much cleaner.