I don't know if such person/people is reading us but...

A clever way to disclose the private key is the next:

Take all the inputs to your address but leave some dust input behind (all those wallets has always some dust inputs)
Then once that you cleared all the balances in all chains except one dust, make a special TX where you manually chose a repeated Nonce value or one with some difference small to be solvable with some math.
Broadcast that TX and someone should notice that repeated or weak R value and the key should be solved easily.