I see what you mean by having a lot of components for the 7RUM and probably dies also.
One thing to consider also is that the RapidZ800 is only available in the 3x12x56 Diavari. The 6x24x56's come in either the RapidZ1000 or the RapidZ Varmint. The Zeiss website
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clearly states the RapidZ1000 is for 308's. If you work the RapidZ Calculator and input the info you will see that even if you get the RapidZ Varmint, to make the ballistics work with a 7mm bullet like the 160 Accubond at 3150 fps you would have to lower the power to 16 or so. So you might as well get the Rapid Z800 which is the best reticle anyway. So you would be limited to the 3x12x56. Excellent scope don't get me wrong, but it will mount extra high on the rifle and that would make me choose the 4.5x14x50 (or even the 4.5x14x44 which is what I have)Conquest anyway (unless someone were giving them away and then I would accept the Diavari, sell it and buy 2 Conquests).
I ran the numbers on the RapidZ800 on the Zeiss website RapidZ calculator and it works out that the RapidZ800 is just about perfect for either the 338RUM (225 Accubond at 3100 fps) or the 7RUM (160 gr Accubond at 3200 fps).
Just giving my opinion, yours to do with what you want, but I would get the Conquest and put the money in the gun or something else.