After roughly searching through Japanese blogs, I came to the conclusion that the Velo Plush VL6146 is the better saddle.
However, I was interested to hear that the Electra Cruiser One, a saddle designed for beach cruisers, is surprisingly good.
It might be worth considering other saddles suitable for beach cruisers. 
And personally I would like to try Panasonic’s Tail-Up Saddle NSSS044 or Soft Cushion Saddle NSSS045. 
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I installed the Panasonic Tail-Up Saddle Light NSSS046 on my mk1, which is slightly different from the one mentioned above.
As explained in the newer STRiDA manual, I removed the original saddle by loosening the bolts and nuts with a 13mm wrench and spreading them apart with a screwdriver, then I was able to install it easily by following the reverse procedure.
The plastic cover at the bottom of the tip, which I was concerned about in
my diary like post, was attached without needing to be removed. It looks like the The saddle position seems to be a little high up in the front, but I didn’t feel any pain in my groin even after riding for just under 10km.
It’s wide (total width 210mm, front to back length 255mm) and has a raised rear end, so your butt is less likely to shift out of position, and thanks to the soft material and the rubber damper under the saddle that acts as a spring, I didn’t feel any pain even after during this amount of touring.
Although I am concerned about the following points mentioned in the quote below and the silhouette which may look a bit unfashionable, it is a good product. 
I hope this information will be helpful for you to find a comfortable STRiDA saddle. Cheers,
Doranine
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