Sorry for the late reply. Im giving the Krovak projection code a big overhaul at the moment (see https://github.com/OSGeo/proj.4/pull/385) and while searching for more information about the projection I stumbled across your kind offer to supply the code for the modified versions of the projection.
The best way for you to contribute is to make a pull request on Github. If you're not familiar with git and Github I'll do my best to help you get started.
> -----Oprindelig meddelelse-----
> Fra: [hidden email] [mailto:proj-
> [hidden email]] På vegne af Michal Seidl
> Sendt: 27. februar 2016 11:38
> Til: PROJ.4 and general Projections Discussions
> Emne: [Proj] Support for Modified Krovak projection
> I have implemented in my local fork of proj source code Modified Krovak
> projection. I have given krovak-m proj.4 code for this projection.
> It can be used to fix missing EPSG codes 5221,5224,5225... in epsg
> transformation file.
> If the proj community is interested or someone else is already working
> on it please let me know how can I correctly contribute to project.
> Michal S.
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