I went HS Grandee also with the Salt System and our local water is terrible. But, I picked up an "On The Go" water softener and it took care of most of our water issues. (https://www.amazon.com/Go-OTG3NTP3M-Portable-Water-Softener/dp/B001FCE0MQ) Now, we've been running the salt system for 1 month and the maintenance is minimal.
If you REALLY want to deal with it, then maybe something like this. Note the first customer photo. That's how you'd set it up for just showering. https://www.amazon.ca/GO-OTG3NTP3M-Portable-Water-Softener/dp/B001FCE0MQ/ref=sr\_1\_8?crid=VOWH5VR8VJN8&keywords=water+softener&qid=1663278489&sprefix=water+softener%2Caps%2C93&sr=8-8
I understand that the are made for lower water flow camping RV's and need to be filled/regenerated every 2 or 3 weeks. Like this one.