can configure the Antminer S19+Pro Hydro to be able to accept this voltage by putting the 58v in series across 4 hashing modules ?
No!
The voltage applied to the strings of ASIC chips is controlled to very specific levels and is set by the miner controller which talks to the PSU. The voltage applied to each chip is called Vcore and has a very large effect on how fast it can run and how much current it pulls at any given speed.
As for cooling... The water flowing through the miner MUST be very clean because there are several very small passages it flows through. You cannot just suck in water from the river/lake/ocean and pump it through the miner.