For similar games, I use gloss acrylics in the small plastic bottles, not tubes. Mix in small plastic closable container. Use stir stick ( like coffee stir sticks ) to mix and to put a drop on a piece of clear flat packaging. Then dry and lay that on the play field to check color match. Repeat as needed till color right.

Then when have color good, mix in water till really thin. That allows for applying by brush or air brush in thin layers. Then when very dry, wax w good carnauba.

Doesn’t always come out perfect. But good if you are not doing the full blown paint / clear coat process.

I’ve had challenges w off white too. A very little brown, sometimes a hint of yellow too.