You're kidding me right? You just have to hold down the letter key to see the accented versions such as é, ö, and ú. Im doing this on ios right now.
Even that isn't necessary when you enable and select the correct keyboard for the language you're typing in. At least for Finnish the three additional letters are added to the main level keyboard (digging them from the accent menu every time would be really annoying).
Watch, but on the new MacBook & MacBook Pro, the 'Taptic' feedback is vastly more subtle and convincing than the short pulses on the wobulator you get on most current phones. When I tried the MBP in a shop it took a while for me to convince myself that it had the new trackpad and not the old-school one with a physical 'click' switch. I don't think you'll wring that sort of experience out of current hardware.