if you want to do some testing, grab a can of quik cure hardner for nason paints ( thier syn single stage enamil line ).
any time you have a question about hardner compatibility.. you can mix some hardener and reducer in a glas jar and then mix in your other questionable adds and look for clumping or clouding.
I know the nason syn single stage enamil does not like MS either.. doesn't care a whole lot for naptha either.. likes their medium reducer.
the magic may play nicer with naptha.
I've painted stuff using the quick cure hardnerr and had finger-non tacky in 15 to 30 minutes.