Life is a compromise. Don’t make the mistake of giving up one desireable parameter for another.
For example, while electrostatic panels may provide the the desired transient response, you could easily give up soundstage and imaging because sound coming from their rears is bouncing all around the room creating all manner of reflection and phasing.
I made my own speakers using JBL 2241H (18"), JBL 2251J (9.75"), and modified ESS Great Heils and the transient response, as well as the soundstage and imaging, are among the best I've heard. Of couse it's taken years of experimentation and tweaking to get to where I'm satisfied.
Here's something... This cut should have quick transients that, at volume, slap you in the chest.