So, the FOTA can run a breakaway series on any EU, NA and African track without any troubles.

They will probably go with the same technical and sporting regulations they have now in order to keep costs down.

They already contacted the MotoGP promoters to do job for them if needed.
A1GP offered to share the tracks and logistics (transportation and broadcasting) with them.

Looks to me that it can be done if it comes to that.