Gave up on this one, keeping notes for reference. Nothing wrong with the server, it will be a nice thing to play with sometime later.
Renting this from kimsufi:
|Atom N2800||2c/4t||1.86GHz||4GB DDR3 1066 MHz||2TB||100 Mbps|
It should be adequate (minimum requirements).
The docs for connecting the plug-in to the wallets on the server are here, along with config instructions for the server.
If we want to use IPv6, I checked with the bitcoin wallets plug-in dev. We will need to enclose it in square brackets (see the thread on his support forum)