The idea here is for an additional free, or low level available Conduit Focus Spell.
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Open Conduit - Focus 1
Free Action
Trigger - You use a conduit cantrip with a duration.
Duration - 1 minute
You use a surge of power to force your conduit spell to remain potent for a longer period of time.
For the duration of this spell, the effects of your conduit cantrip do not expire. If you cast a new conduit cantrip, the effects of the new conduit cantrip immediately replace the effects of the previous cantrip.
Heightened (5th?) - When you cast a new conduit cantrip, the previous cantrips effects remain in until your current turn ends, in addition to the effects of the new cantrip.
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The idea here is to reduce the action economy issue people have with Boost and Reinforce Eidolon and remain future proof for other similar abilities.
I dont want to throw away Boost Eidolon, because I believe it could be made interesting by adding feats to allow it to extra things, like add temporary weapon traits to your eidolons attacks (as discussed elsewhere, things like Reach, Trip, Versatile (including elemental), etc.) And otherwise be made fun.
Similarly, I think you could add things like elemental resistances to Reinforce Eidolon to make it more compelling as an action.
Thoughts?
Spending a focus point to make conduit cantrips function as stances for a minute seems reasonable. I'm worried that making it a feat makes it a must-have potentially though, since summoners aren't getting any of their level 1 feats for free from something.
The trade off with evolution surge is interesting with this though. Worth considering.
Evolution Surge does a lot for some concepts, and not much at all for others.
Including this as a free addition (or even an option, with the other available via feat) has the added advantage of addressing that.