"You do not want all that mud and muck in the bottom of the anchor well."
All that STINKY mud and muck.
Perhaps if NA or boat assemblers spent some time cruising or at least on board a boat there would be a "plan B"
The simplest I can think of would be an anchor well that not only held the line and/or chain properly , but included a self wash down setup. Self draining of course!
Hours underway would wash most stench off with mere time , so any DC pump would work.
For folks with larger engines , where all the sea water coolant can not be dumped into the exhaust,, the bypass line could run to the chain locker , as well as the galley sink.