Use them to burn fuel while training.
Seriously, it costs Sweden extra ~400 Fuel per day to maintain the same 0.33 xp/day balance with all those Coastal Defenders left afloat, which you otherwise get with just one of them (plus HMS Gotland, which is good enough of a ship). Importing 400 Fuel means 2 CIC traded away, and by the time these rusty tubs actually see any military usage they will have inflicted quite a drain to the build-up phase.
Now some might discard that arguement due to their own reasons, but saying keeping ships pre-war only costs a little manpower is simply not true. That, or you simply miss 100 Naval XP per year when it matters the most.
This seems like a straw man argument. Why would you bother using these ships to train instead of ships that use less oil? Let them sit in port until needed. A few CD ships getting xp are not ever worth using CIC. But they are certainly worth having around if you plan on fighting Russia or Germany even if it costs you some questionable naval xp.
Now if you are going to fight the RN or USN nothing Sweden has is worth a bucket of spit against those behemoths unless you are playing MP with lots of allies.
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