Comment (by Gabriele Bozzola):

Our group (University of Arizona) has already ported the con2prim to Einstein Toolkit and has a preliminary version of integration with IllinoisGRMHD. In its current stage, the code is not ready for release, but a lot of work has already been done and more work is ongoing.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2414/include-con2prim-framework-by-siegel