Select Only One Attribute Type

I’ve set up a new test site for paint products.

Here’s my first test product: https://fe7.02c.myftpupload.com/shop/industrial-paints/brushing-enamel-metal-paint

I’ve attempted to set variants up so that you can only select a colour from saver colours OR all colours.

IS there any way to do this more cleanly, or without using an NA option that I’ve added in like it currently is?

Many Thanks,