I can buy Ridea and Hubsmith Birdy disc front hub separately.

For the rear hub, as said the problem is to have a freewheel body that accepts a smaller cog with less than 11t. Besides Sunrace and its proprietary body derived from the old Shimano Capreo, there are now SRAM with XD/XDR, Shimano Microspline and Campagnolo N3W

Thanks for the video.

But this Brompton front block adapter for Birdy is not the H&H adapter that I have, see picture below from the website of Bikegang (mine is slightly different from the first picture, it is like the second 3D drawing).

As you can see, the angle of the Brompton block is very different on the two adapters, on your it is much more vertical.

When I turn the fork, it also slightly pushes on the clip but not enough to unlock it and it only happen at a big fork angle that never happens when riding.