install one of these or a device like it.
our house has one. My shower use to have a heart beat. Now it’s steady and the demand water heater works just fine. Although I am rather sure it has a flow meter and can adjust on the fly to different flow rates.
I had thought to eliminate the existing pressure tank which is over forty years old and shows it's age. I'd let the down hole pump dump into a large gravity tank (plastic Farm & Fleet special??) with a simple float switch to maintain a supply. I'd then use a separate booster pump to charge a new pressure tank with a rolling diaphragm to prevent "water logging" from loss of pre-charge, thence to the R/R valve. Only problem is lack of space for the gravity tank. Why a gravity tank? We have lots of sediment, grit and very fine clay which would have a chance to settle out w/o a filter. Don't know if the rest of the plumbing would stand up to 45 psi plus an occasional water hammer shock, I really don't want to find out either.
We have hydronic heat and have always had a R/R valve in the inlet line to the "boiler", it's set at about 15 psi.