I hacked the modify epub plugin to perform the dirty solution mentioned above to strip line-height and font-family from the css. This way it is only one click. But as mentioned, in some special cases, this leads to small problems. I think I uploaded my modified version somewhen here, maybe you find it with a search. It is an older version of the plugin, but it should still work and it is even very simple to copy the few changes to a new version.
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