Hot water travels about 60 feet from the tank to our upstairs bathroom and it takes too long to get there. I'm thinking about installing a point-of-use heater with a mini-tank but don't know if it will do what I want. Can I install a 2.5 gallon POU heater in the hot water supply to the bathroom and expect both immediate hot water from the POU heater and a reasonably seamless switch to the hot water from the central HWH when it gets there? There's about a half gallon of water in 60 feet of 3/4-inch pipe. There is not currently a tub or shower in that bathroom (I took out the old clawfoot and have not replaced it) but there will be so I don't want to make the POU heater the only HW source.

Google couldn't find anything here on this subject newer than 2007 so I'm hoping for some more recent experience.