Ahh, rozpruwacz is Marek 
I now have the DVB-S and DVB-T tuners for the WeTek Play2 and the DVB-T tuner in the O2.cz box showing up in Tvheadend. I am able to run a scan without errors. However I have no Satellite dish or Terrestrial antenna to connect them to so all scans find zero services (as expected) so it's impossible to tell whether anything is really working 
I've pushed an updated set of images to my testing share. The WP2 image and 'box' image will boot the default WP2 device-tree which contains no DVB support, so you will need to edit extlinux.conf or uEnv.ini and change the dtb name to one of:
- meson-gxbb-wetek-play2-atsc.dtb <= might not work, I didn't find the ATSC tuner module to test yet
- meson-gxbb-wetek-play2-dvb-s.dtb
- meson-gxbb-wetek-play2-dvb-t.dtb
The O2.cz box (SML-5442TW) and the GTMEDIA GTT-2 box Marek has been using both have DVB support enabled.
Once WP2 is rebooted with the correct device-tree file dmesg should show the cards, and you can install Tvheadend43 (or VDR) to scan for services. I'm a bit vague on the remaining process as (as mentioned) I can't test anything.
rawnar I've also included a WeTek Hub image in the test share. Apologies for the long wait, I got a bit distracted.