An Arcane whatnow?

Over the last few days I've been playing around with Hero Lab a bit more, trying to squeeze in the last few elements of the first Achtung! Cthulhu book, Three Kings. It's been a bit nightmarish as some elements on characters do not conform to the Savage Worlds standards, for example Mythos spells.

In Savage Worlds you need to have an Arcane Background in order to cast spells... in Achtung! Cthulhu and Realms of Cthulhu you don't; spells are cast using your Knowledge (Mythos) and have modifiers to the roll instead of power points. The way the Savage Worlds data file has been written doesn't allow you to bypass this in any way, which is awkward.

I'd love to be able to create a proper Mythos Arcane background that doesn't actually do anything other than allowing new spells to be assigned, but this causes problems with the validation as you're only ever allowed 1 Arcane Background in Savage Worlds. In most A!C games that probably won't be an issue, but if someone actually needs to use one of the other Backgrounds for anything, such as Weird powers or Superpowers for the Godlike crossover we'll be in trouble.

The Go To workaround for anything that adjusts a character post-creation seems to be to create things as Hindrances as these can be added at any time and do not require any advances. There's something about this method that really bugs me... If anyone can work out a better solution I'd love to know!