What's great about this is you're hedging your bets (prudent) while acknowledging the worker's needs as well. The problem without some kind of middle ground like this is that it reeeeeally feels like getting screwed when you're working above your pay grade for an extended period of time without explicit acknowledgement. I've had a lot of unhappy friends in roles like that where they were doing team lead / manager stuff and getting jerked around by HR and their boss for months or years. Now they're hypersensitive to anything that smells remotely like that experience. I like how you're making a public commitment but making sure to manage your risk. It's a great compromise.