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This is a simple use of two boards and two sets - either two standard sets with one of the Kings marked as a Queen (e.g. with a coloured string tied round it) or two sets of which at least one has a spare Queen (I have often thought that a Henry the Eighth novelty set with spare Queens would reflect history well). If going down the King-marking route an interesting further variation would be to mark the d-file piece as a Marshal (Rook+Knight) and the m-file piece as a Cardinal (Bishop+Knight). This would have the advantage of being able to refer unambiguously to the 'Marshal's Bishop', 'Cardinal's Knight's Pawn' et cetera!