Something like this:
[] All Stars, Extra Dwarf
-[ ] [CAPSTONE] Stone Flower
-[ ] [RUNE] Dwarven
-[ ] [STORAGE] [Expensive] Runed
-[ ] [FOUNDATION] Grey Lord
-[ ] [TRANSMISSION] Both (Jade Riverine)
CAPSTONE REASONING
We need to include the elves in the first template somehow, and the stone flower, much as I dislike requiring High Magic, does seem to be the qualitatively best option- the collegiate enchantment isn't very robust, the dwarf method lets extra dhar through. Furthermore, it might be High Magic, but at least it sounds like the simplest possible application, so if it has to be included, this is the least compromise we are getting.
RUNE REASONING
It's a rune. It goes to the dwarves. However, given the fact that it could, apparently, be made just by a muggle mason,
I don't think this is enough buy-in.
STORAGE REASONING
This is where we get the real dwarf buy-in. I furthermore think it also just so happens to be a happy coincidence that dwarves are very rich, so the expense isn't as big of a deal, and runecraft sounds like a very, very good method for reliably storing large amounts of magic without shenanigans happening because of it.
This is giving the dwarves arguably the bit most suitable for their skills- reliable storage of energy, materially expensive.
I don't even consider the reverse-engineered option. There is like
one human in a thousand years that has managed the level of skill necessary for this. I think it'd be extremely unwise to make
that the standard model, even if it may become easier, I wouldn't hold my breath. We have nothing short of three other options which are much simpler and seemingly equally viable- if not better.
FOUNDATION REASONING
Collegiate method is politically not good, and it's also highly restrictive- only Lights mean 1 in 8 human wizards, that's a huge bottleneck and it also creates undesirable internal political pressures, beyond the "messing with dhar" one. Grey Lord method can be done by any flavor of wizard, and is therefore highly scalable, without requiring clockwork's monthly maintenance.
TRANSMISSION REASONING
Leylines is a freebie, no reason not to unless it's literally impossible for a region, given that we have the passphrase, so the hardest part is already done for us. Furthermore, the jade method presents a very good opportunity, both politically and practically.
Politically, it's a massive victory to be able to point at our model and say "this is objectively better than the ancient wonder it's replacing".
Practically, a fuck-off stone monolith at the bottom of the river is a sensational back-up. This means that the network getting temporarily disconnected won't flood an area with pooling magic. It's just an incredible upgrade in keeping the network reliable.
The fact that it creates a buy-in for the empire is icing on the cake.
@picklepikkl This is what I think would be the most optimal performance and balance between political buy-in between Empire, Karaz Ankor and Elves.
Hell, the riverie thing means it probably works in Kislev, too.