Go with the Koh-I-Noor Mondeluz then. 72 for roundabout 50.00 EUR. Super quality, great price, available open stock. A Pentel Aquash waterbrush 5.00 EUR.
A piece of plastic roughed up with sandpaper and you can liquify the pencils off the paper and paint larger areas quickly and get great blends.
Read this for the process:
https://peakd.com/art/@wulff-media/great-painting-hacks-and-some-urban-sketching
I'll keep a look out for them and check your post or the tips
Thanks :)