It sounds more like a task for Carbon Copy Cloner. It will compare a source to a target and update everything that is different on the target.
Time machines are very partial to a certain device, as far as I know, and I imagine it would not be easy to coerce it into restoring multiple times over another device. I am not an expert, but my understanding is, that the use case for TimeMachine is to restore a backup onto the device it was taken on, or onto a virgin system. Or, using the Migration assistant, onto an existing system, but incrementally onto that system, in way that, if you have a newer OS version on the target, MA wouldn't touch that, but it would only push the documents and apps; so my initial use of "incremental" is not totally adequate here, but I was a bit at a loss as to how better to describe it.
I am having the exact same question and Time Machine seems a bit cumbersome, more like a hack. CCC, on the contrary, will make an incremental sync. I just did the Migration, and am finding that Time Machine will not really allow me to keep my old machine around in case of an emergency, while keeping it updated to hit the ground running when my primary machine has a boo-boo. You can schedule CCC like you can TM, so, if you use your backup as a target disk at all times, you can keep very close syncs, so you never lose much data. Hopefully. But I will see how that works out. I travel a lot, and having two laptops in my hand luggage almost maxes out my allowance by itself on most airlines ;-) Last weekend it worked fine, but nobody weighed my rucksack ;-)