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Maximizing number of accesories
Number of accessories: 19 pieces.
Regicide score: 19 - 3x4 = 7 points.

Cheap solution, which is the setup in the post, shifted a bit. The unique mate is Bg7#.
The four black queens are witnesses, the rest are accessories.

We might be able to add black rook at e7 for one more accessories by adding black pawns at f7 and e6 (and remove d7), but I think it's not a legal position (not reachable from initial setup).

Maximizing the regicide score
Number of accessories: 10 pieces.
Regicide score: 10 points.

Unique mate: c6#.

Maximizing number of accesories
Number of accessories: 19 pieces.
Regicide score: 19 - 3x4 = 7 points.

Cheap solution, which is the setup in the post, shifted a bit. The unique mate is Bg7#.
The four black queens are witnesses, the rest are accessories.

We might be able to add black rook at e7 for one more accessories by adding black pawns at f7 and e6 (and remove d7), but I think it's not a legal position (not reachable from initial setup).

Maximizing the regicide score
Number of accessories: 11 pieces.
Regicide score: 11 points.

Unique mate: c3#.

Maximizing number of accesories
Number of accessories: 19 pieces.
Regicide score: 19 - 3x4 = 7 points.

Cheap solution, which is the setup in the post, shifted a bit. The unique mate is Bg7#.
The four black queens are witnesses, the rest are accessories.

We might be able to add black rook at e7 for one more accessories by adding black pawns at f7 and e6 (and remove d7), but I think it's not a legal position (not reachable from initial setup).

Maximizing the regicide score
Number of accessories: 11 pieces.
Regicide score: 11 points.

Unique mate: h6#.

Maximizing number of accesories
Number of accessories: 19 pieces.
Regicide score: 19 - 3x4 = 7 points.

Cheap solution, which is the setup in the post, shifted a bit. The unique mate is Bg7#.
The four black queens are witnesses, the rest are accessories.

We might be able to add black rook at e7 for one more accessories by adding black pawns at f7 and e6 (and remove d7), but I think it's not a legal position (not reachable from initial setup).

Maximizing the regicide score
Number of accessories: 10 pieces.
Regicide score: 10 points.

Unique mate: c6#.

Maximizing number of accesories
Number of accessories: 19 pieces.
Regicide score: 19 - 3x4 = 7 points.

Cheap solution, which is the setup in the post, shifted a bit. The unique mate is Bg7#.
The four black queens are witnesses, the rest are accessories.

We might be able to add black rook at e7 for one more accessories by adding black pawns at f7 and e6 (and remove d7), but I think it's not a legal position (not reachable from initial setup).

Maximizing the regicide score
Number of accessories: 10 pieces.
Regicide score: 10 points.

Unique mate: c6#.

Maximizing number of accesories
Number of accessories: 19 pieces.
Regicide score: 19 - 3x4 = 7 points.

Cheap solution, which is the setup in the post, shifted a bit. The unique mate is Bg7#.
The four black queens are witnesses, the rest are accessories.

We might be able to add black rook at e7 for one more accessories by adding black pawns at f7 and e6 (and remove d7), but I think it's not a legal position (not reachable from initial setup).

Maximizing the regicide score
Number of accessories: 11 pieces.
Regicide score: 11 points.

Unique mate: h6#.