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Its straight forward to work out but if you are looking for a kit like that on the facebook forum someone is selling a custom MeisterR GT1 coilover kit with the setup you need already. Its a good bit of kit and only has testing miles on it.
In short you basically double the spring rate in the standard position so for the AST coilover designed for 80nmm springs you want roughly an 160nmm in the OEM location. Due to the way the springs work i'd run a tad softer if you are stripped out - maybe 140nmm. It will need to be custom wound so getting the ride height worked out may be your most tricky issue though if AST have that worked out happy days.