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Just my 2 cents, but if it were me I'd just install everything new.
I think the upgrade path may be a bit arduous and unstable for that many revs
For NTA, You really shouldn't need any historical flow data. That gets created so quickly that you'll have plenty from install point moving forward. And you could just shut down the old instance and make the IP on the receiver the same as your current one. I've had to re-install NTA on the upgrade from 11.5-12 and it is a no brainer.
The NPM setup would be the most arduous considering you'd have to re-discover your network, but once that is done the devices just get walked the same anyway.
I think the risk of the upgrade is you could get through some of the steps and end up having odd issues once you are done
Are you using VMs or physical? What kind of flexibility do you have to create new servers?