is there a way I can get my 6970 to work with my R9 290 with the latest AMD drivers installed without downgrading Drivers?
No, since both GPU's need to be running the same driver version.
Why are you wanting to? Even if it were possible the R9 290 is over twice as fast as the HD 6970.
because I want to use my 6970 for something else
Attempt to manually install drivers for each GPU.That is,do not use the standard installer,but update the INF file from device manager.If under w10,you might have some issues with the WDDM levels.
MODERATOR NOTE: I am glad to see you have resolved your issue. To help keep this post on topic and help other with a similar issue, I am locking this thread.
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