No doubt that the TVC 3 series is a great stable platform----but it's also way overkill for your stated camera (Sony A7r) and intended purpose for hiking. But you know what they say, "Go big or go home!"
I'd suggest the TVC-24 (or even TQC-14). It's plenty stable for even a much larger camera than your A7r. I use a Phase DF and Cambo WRS on a TVC-24 and TVC-33.
The Manfrotto 410 is heavy----it's heavier than the AS Cube! And not nearly as capable. The 410 will be top-heavy on the TVC-2 series.
If using nothing but a small camera, you might want to consider the Sunwayfoto GH-Pro, a fairly small and lightweight geared head. It is inexpensive compared to other geared options. I'm about to release a detailed review on my blog on the KPS T5 geared ballhead, which is much closer to the Cube in both quality and capability. More expensive than the 410, but much lighter than the 410, and hugely more capable. The T5 is fine on the RRS TVC 2 series.
ken