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> have a Nano S which i used as a recovery by entering my MM seed phrase
You understand that doing this was a really bad idea, as it defeats the security of the ledger, right? Basically your MM seed could have been previously compromised (but not exploited yet), so it is very dangerous to use it, and the ledger offers you no full protection in that case.
And no, you cannot combine several seeds.
The only SAFE way to use a ledger is to use only the seed that was generated by the ledger (i.e. never enter a seed coming from a software wallet like MM), and to transfer all your funds to the accounts derived from your ledger seed.
You can then use all your safe ledger accounts with MM, by using the „connect hardware wallet“ feature in MetaMask.
> By the way, these are BSC tokens not supported yet by Ledger
All BSC tokens are supported by the ledger device (i.e. can be secured with the ledger, via MetaMask), but not all are supported by ledger live.