Ethereum ERC20 token transaction between private(Hyperledger Fabric) and public(Ethereum) blockchain

I've developed a case study based on Hyperledger Fabric using the fabric-chaincode-evm in order to develop Solidity smart contract.

Using chaincode-evm there's the Fab3 proxy in the middle between Application and Fabric Network that map the Fabric User with an ethereum address generated on the fly.

1. There's a way to run transaction of an ERC20 token over a public Blockchain(Ethereum) starting from my private fabric chaincode(smart contract) ?
2. There's some way to change the eth address generated by Fab3 proxy with my own eth address, or linking Metamask for example.