Watercolour palette woes

I recently purchased a very cute little travel watercolour palette - Eraldo Explorer's Watercolour Set from Riot - with intention of replacing the paints with my own tube watercolours. Hilariously it turned out the existing paints are glued so firmly into the pans that I can't remove them, and the replacement empty half pans I purchased are too big. So now I have to carefully sand down 1mm from each pan to make them fit.

ANYWAY, once that's done I need to choose 12 colours to go in the travel palette and I would love to hear from other people who work with watercolours. I mostly paint flowers and landscapes but with a travel kit I might end up doing urban sketching... To be honest I spend more time researching paint pigments and watercolour techniques than actually painting.

I've shared my watercolour spreadsheet here.

Questions and advice welcome!