Good news!

Naked portafilter has been delivered and I am quite happy with it. It works well with this basket:
https://www.amazon.co.uk/dp/B00GRS611Q/ref=pe_385721_139953761_TE_dp_1

There is one downside of this portafilter. The build quality looks poor. So if you are going to order it, I recommend ordering 2 at once. The  build quality of the original DeLonghi portafilter is top shelf comparing to this one.

I ordered from this chinese site: http://bit.ly/2jKKx65

To get this item, I had to register in yoybuy.com service that can order this chinese item for me and ship it to me. Yes, it's complicated, but I do not know about any other way, and I can't read Chinese :) If you can, I bet you can order directly from that taobao.com site.

The portafilter on the picture looks great, but it is not what it looks like IRL. There is no chrome handle, all is made of black plastic. But the most important thing is: it works. With that portafilter, I also ordered 2 non-pressurized baskets and they also work well, although not that well as the one bought from amazon. Link to baskets:  http://bit.ly/2k4d4Xx - good thing about this basket is that it is much smaller than that 4-cup Amazon's one.

I remind you that you will have to use 49mm tamper with all these baskets.

Right now, I am happy with my Dedica setup.

If you have any questions, please let me know.