I do it all the time on a 55, 45, 29. Just do 25% 2x per week. Changing the water takes me less than 1/2 hour.One of my tanks is 30 some feet away from the faucet in a different room....I end up dashing to and fro to make sure the temp is proper.
I also keep an eye on the setting of the faucet where I receive a mix of water - warm/cold - ...am making sure that the hose is already filled with this warmed water, and then procede to filling the tank. After 5 years of doing this on that tank, I have not experienced any problems. Having to lug the gallons for the 55fer would kill me.
Good luck.
As for the water temp. I too am on a well. I add enough hot water to temper it. But it is still lower than the tank temperature. Been doing it that way for 30 years in 2 different states and 4 different houses. Have never had a loss or outbreak because of temperature. Your temperature can change also depending on whether the pump is running or not. Your pressure on a well isn't constant like it is for utility water. It will vary from 35-60 depending on the setting of the pressure switch's turn on/turn off range.