Apologies if my comment came across as somewhat coarse, that wasn’t the intention!
In my defence it was late and the children were being awkward at bedtime…
What I meant was, rather than bi-amp the centre channel, use a more powerful amp and then use jumpers at the speaker end?
I’ve historically used AV bypass on a NAIT for Fr L/R and then used an AV amp for the other channels.
I’ve now simplified things somewhat and have a Linn Selekt DSM with integrated amp modules, this is setup for 5.1 with 3x amp modules covering Fr L/R + Rr L/R + Centre/Sub. It does have an Exakt hub as well so you can configure it for 7.1 and the surround processor module can be setup for that.
It can also be configured with Balance/Unbalanced output modules and even a mix of internal amp modules and line output modules, as well as a mix of Exakt and Non-Exakt speakers, enough to keep me tinkering for years I’m sure.
I have looked at driving the Fr L/R via balanced out to a NAP 250 for example, I think it will depend on how I find the setup overall working on the basis of it being entirely integrated.
I’d say my reasoning for going the Linn route was that it was a modular design that I could configure as I needed over time, even later on using it as a digital source only for example.
It gave a simple setup that could handle multiple scenarios in a shared family lounge importantly and not take up much space to do so.
It sounds like you’ve found an interesting solution for using the NAP 100, I’ve no personal experience of that amp myself and now of course being out of manufacture reliance is on the used market but if it suits your needs and can be sourced at favourable prices, likely a viable solution.
Did you try other NAP’s in the process, could you use a SNAXO in the mix perhaps?
Using a 2 channel NAP could allow a split between 2x centre channel speakers combined with a SNAXO.