Generally struggle to get coloured translucent acrylics over 3mm (sometimes 5mm) so I’d go with vinyl too, look to use warmer / yellower LEDs, preserves the colour better on yellows / oranges, otherwise they can look a little washed out.
We did an illuminated sign the day before lockdown using a Translucent teal vinyl.
see pics below, they appear a sort of blue in the picture but does appear as teal in the flesh, so to speak.
I would take this route any day, over having to buy a sheet or half sheet of teal acrylic. only for the offcuts to sit in the rack for months on end waiting on someone wanting a sign that colour. Of course, if someone is willing to pay for the coloured acrylic and are maybe specify this, then that’s different.