I ended up keeping the ALAN Alu Cross after all. I decided to stick to
my initial plan to make this a budget build and so I sold off all the
other bikes and parts I purchased for this project. All but the groupset
that came off the Diamant cross bike. You can see the end result below.
I did my first 50 km off road ride last weekend and everything worked like a charm. With the Edco headset from the Diamant the fork has somehow become super stiff.