Have you ever seen anybody with micro pigmentation in person? (not photos, they can be deceiving). I have never seen anybody who had this done (only photos). Reports are conflicting, about how this looks. Some people say it looks good, others say it doesn't.
I guess you are asking about harvesting grafts very heavily from the sides (basically clearing the area out) and then micro-pigmenting the area where the grafts used to be? This sounds rather extreme (but not impossible). You would still need to find a doctor who does excellent FUE work (FUE doesn't mean a thing, if the grafts don't grow, or if they aren't angled naturally, or if you have terrible scarring in the donor area). And because many of the best doctors might hesitate to do radical approaches like this, it might be difficult to find a good doctor who agrees to do it. However, there seems to be many doctors who would be happy to take your money and then experiment on you. Be careful.
Also, something else. Not all the hairs on the side of the head are permanent. Transplanting them would be a waste of time (even worse, actually - it would cause scarring in the recipient area, without the benefit of a hair growing there). So you'd probably leave a lot of the hair on the sides alone. So your micropigmentation would have to match the remaining hairs that didn't get moved (possibly difficult). You know the area where strips are taken from? That "sweet spot" is where the most 'permanent' hairs are located (it's no accident that is where strips are taken from). Once you go outside that zone, the hairs are likely to be less permanent, the further you get. Just something to consider. I don't have an answer to your question, just wanted to bring up some points.
I would not want to be the first person to try this.