just for the records, I have just connected my Kiwi to the Wifi, with a cheap D-Link DWA-121. I can see the improvements in the noise spikes (was already good, now it's better), so for me it was worth the effort. Thank you very much to all those who contributed instructions.
In addition to the wlan config (mine showed up as wlan0) I had to install kernel 4.9.147-ti-r121 following the useful advice given here:
and compile the module rtl8188eu following these instructions:
Thanks to all!