Yes, it's been done. There may be some bleed over to ground in the outlets which may cause some of the most sensitive power pedestal breakers to trip.
I'm still researching whether I will do this on my boat. If I do, it will likely be only 2 or 3 as the bleed over is cumulative. Would also suggest buying 1st quality outlets like Leviton.
I'd make sure to get one that has only USB-C. Those old school USB Type A ports are likely looking more dated by the day with everything that has gone or is going to USB-C.
Yup. I'd just like to suggest all Type C. You can use a mixed type cable for any old Type A devices. And in a couple years, there will be no use for the Type A at all. The outlets will date themselves like screws on a wall plate for dipole TV antennas.
But unless you want a SINGLE outlet I'd still go with a plug-in module, especially one that supported more than one device. Charging standards have changed a lot in the past decade and will no doubt continue to change. But meanwhile AC outlets are the same as they ever were. You can swap out a plug-in module for a lot less time and money than swapping hard-wired modules.