What does that mean, exactly? You clearly couldn't implement Bitcoin the software since there's no way to speak the protocol or even utilize the data structures involved, let alone the absurd amounts of data that needs to be moved. It's like saying you could implement MySQL in Ethereum, which at least has no canonical global data store to it.
You could parse scripts and verify transactions, and that might be useful inside the Ethereum world. But it wouldn't be useful outside of it. It would still scale like Ethereum and you would need to process the entirety of the Ethereum blockchain and the Bitcoin blockchain to do useful operations.
You could parse scripts and verify transactions, and that might be useful inside the Ethereum world. But it wouldn't be useful outside of it. It would still scale like Ethereum and you would need to process the entirety of the Ethereum blockchain and the Bitcoin blockchain to do useful operations.