I don't know much of anything about that type of technology, but I think it's far more useful to judge these types of theories based upon the political side. This means questions that go like:
If it was a conspiracy, it must have been carried out by some group. Who was that group?
What are the goals of that group?
Why did that group decide that the proposed plan was the best way to use their limited resources to achieve their goal, as opposed to some other plan?
I suppose the group here would be Putin and/or some group of Russian nationalists, and the goal would be to get the Ukrainian conflict out of the news.
Then the plan would involve a highly elaborate scheme of secretly designing sophisticated equipment, performing careful analysis, and smuggling highly-trained personnel onto a flight for the purpose of secretly diverting it to an obscure airfield. Then you'd have to execute all of the passengers who weren't in on it and dispose of their bodies and the plane somewhere where they won't be found for a long time, and make sure that none of the people who were in on it ever talk about it. And if you screw any of that up at any point, then you get the opposite of what your goal was - massive media attention of what a world-class asshole you are.
But if the goal is to disappear the flight for news coverage, why bother with all of that when 1% of the effort and even less risk would get it to crash somewhere in the Indian ocean, where it would likely never be found?
Why bother with any of it at all? Aren't there lots of much simpler ways to distract the news media? Does anybody in Russia even care that much what the Western media thinks?
Another thing - what about China? As far as I know, the US and Europe are currently unhappy at Russian interference in the Ukraine, but China don't seem to care much. There were a lot of Chinese nationals on that flight, though, and I bet China would be very unhappy indeed if it was ever discovered that they were killed by Russia in a ham-fisted attempt to distract the Western media. Possibly enough to lead to a change in the Chinese position on the conflict, including diplomatic, economic, and maybe military support for the Western position. Why would Russia take that risk, when there must be far simpler options out there?
I find that a lot of conspiracy theories fall apart under this type of analysis, without even paying much attention to the technical details. If you want me to believe that this happened, you've gotta come up with a group and set of goals that make it look like a good idea.