Does the visualiser support fixtures with colour wheels?

Yes, so long as the colour wheel channel in your fixture file is defined as a colour channel with named ranges (and the fixture has no RGB channels).

The visualiser will recognise ranges containing these strings:

“black” or “off”
“red”
“green”
“blue”
“white”
“yell”
“pink”
“mag”
“cya”
“ora”
“purp”

For example, a range called” light purple” would be recognised as “purp”, and the visualiser would render it as purple.