Installing RealVNC armhf version on Ubuntu Mate 20.04 (arm64) on Raspberry Pi 4

I'm trying to get VNC running on the above and I'll try and quickly run down how I managed to get to the position where it's almost working.

So I installed the arm64 image from RealVNC download and then obviously got this error as I'm running the arm64 Ubuntu Mate and RealVNC only offer an armhf one:

error wrong architecture - run dpkg --add-architechture to add it and update afterwards

So I forced the architecture by running:

 sudo dpkg --add-architechture armhf

When I ran vncserver it kept complaining that some files of /usr/lib were missing, so I copied a load of them from this Github backup here to usr/lib and that seemed to allow vncserver to run.

Yes I know this is not the best method, but it seems Ubuntu Mate is still in beta. Anyway, vnc setup a password, key, etc. and gave me my local IP and a session number/port. When logging into it it asks for the username/password, waits a few seconds and then returns 'access is denied'. I should note that when running the xstartup.sh script in /home/user/.vnc it used to say cannot find /home/user/.Xresources file. I did notice that error appears here in this guide yet it's not mentioned as an issue?

I think I ran touch ~/.Xresources which made that error go away, but when I run the xstartup.sh it just leads to a blank terminal window.

The last two log files are here: Pastebin1 & Pastebin2. The second is the only one that shows the client being rejected. So, in short I think the VNC login errors are something to do with the frontend desktop environment rather than forcing the architecture / copying over files.

Any ideas at all please? How do I fix the desktop environment to allow the VNC connection?

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