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I don't think that the rules are already clear and easy-to-understand.

First of all, it should state the initial array and the pieces of the game (I somehow infer it is the standard chess pieces in the standard initial area).

With all kind of swaps: What are the moves of a pawn being swapped to the first rank? Has it double or even triple moves available, or does it just a single step to the second rank? When it has stepped to the second rank, has it
a double move or not (a strict reading of the FIDE rules having "original square" in their wording would allow only a single step, since it is subsequent. Quite hard to track by looking only on the board)?

With inner swaps, it should state if a swap between two identical pieces (e.g. two knights) is allowed, creating the possibility to voluntary cede a tempo. This option would change some endgames (e.g., making two knights and king against king a win instead of a draw).

I think the bishops rule is theoretically flawed, since it is possible to have two bishops of the same field colour by pawn promotion (it is just really unusual to promote to a bishop because promotion to some stronger piece is almost always preferable).