Help: Trouble with Multi-Sig Wallet private key

Hello,

An old ETH ICO participant here. I sold 95% of my ETH too early back in 2017 😅 & have some locked up in a multi-sig wallet created from Mist which I need help recovering

I created a multi-sig wallet (4-sig out of-5) with 4 other newly created wallets in 2017 for additional security before checking out of the scene.

I tried to access the wallet recently and haven't had much luck as the Mist wallet has been deprecated. I tried using the myCrypto API and it seems, though I have all the correct passwords for the 4 other wallets + genesis wallet that are all part of the multi-sig, the private key for the multi-sig doesn't recognize any of the passwords except the genesis pw (I can upload the UTC file and use the genesis wallet's password & all other 4 wallets return as invalid pw's)

Is there a way I can brute-force different permutation of the multi-sig wallet with MyCrypto API locally or revoke access/ownership of all 4 other wallets with the genesis wallet & merge it into a single wallet?

Thanks so much for reading & your help! If you'd be so kind to suggest other means, I'd greatly appreciate the help!

Best