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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It’s not as bad as the STRiDA MK1, but after about 10km my butt hurts, so I replaced the saddle with a wider VELO Plush VL6146, and at the same time lowered the saddle height, which was too high.
Removing the bolts and removing the clamps to adjust the STRiDA saddle height is a real pain…
I also transplanted the taillight base (RM-1 544-6510) and CATEYE OMNI5 that I had been using previously.
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