I think you should keep the Z.
Based on your previous posts, it looks like you've put a lot of time and money into your car. Not only just aftermarket parts, but the time it took to research them and the time and money it took to install those parts.
In the end you would probably break even if you factored in all the time and money you spent on the Z. And then, you will probably end up modding your FR-S, so that's more money and time that you'll have to spend.
Now, if you really like the FR-S over the Z, that's a different story. But that doesn't sound like it's the case.
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2012 Sport | Hankook R-S3 | StopTech | Motul RBF600 | K&N Air | Nismo Exhaust | Z1 34
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