I cannot pass ETH to employee, because they might "spend it" and at the same time why they would use their own ETH?
Why do you think they'll do this?
Ethereum as a crypto, they can do whatever they want. They can spend, hold or trade it as long as it's on their hands or wallets. I want you to go through the Ethereum forum but it's not active anymore unlike bitcointalk.
If there's still no suggestion found, how about asking it on their sub-reddit?
https://www.reddit.com/r/ethereum/