I have not seen a glider where it is physically possible to cross-connect the controls simply through the process of de-rigging and rigging (removing and replac

I have not seen a glider where it is physically possible to cross-connect the controls simply through the process of de-rigging and rigging (removing and replacing the wings and stabilizer, which is often done for transport or storage), though I imagine there were examples in the past. I have, however, seen ones where the controls can be left unconnected or even insecurely connected (though such designs now seem deprecated), in which case they may move in the correct direction on the ground, but fail to do so under load (and may flutter). On account of these possibilities, the visual inspection and pull/twist test of the connections, together with positive control checks (where someone holds the surface to provide resistance), as mentioned in the article you link to, should be SOP.