Untradable Evo Ring II and Tradable Evo Ring II stack.

I see this as two options..

One: Use the glitch, and when it gets patched.. just use the Untradeable on your main.. sell/use the Tradables..

Two: Don't use the glitch, and have the option of using/transferring/selling all your Evo II Rings

Depending on how long till this gets patched, I say Two is your best option unless you're positive you're keeping the Evo II Ring on your main permanently and/or know this glitch won't be patched for a while~