Hello there, sadly there is no way to import swatches into Sai without killing all your custom brushes and things, you'd have to install 'my' SAI with the swatches pre-installed.
If you really need these swatches in SAI then I'd advise you to try this tutorial : [link]
to increase the amount of swatches you can store in SAI. Then open this in SAI :[link]
Then Eyedrop each color you wish and shift-click it into a new swatch. It's tedious, but I think it's the only solution, sorry.