Hi Pete,
Thank you for using Syncfusion products.
We have checked your reported requirement and we would like to let you know that your requirement can be achievable by using ColorPickerFor. You can find more details about this in the below online demo link.
For your convenience, we have prepared a sample based on your requirement and the same can be found in below link,
Could you please check the above sample and get back to us with more information if we misunderstood your requirement or you need any further assistance on this?
Regards,
Vinoth Kumar S