Would be great . So far I have been using a stand alone controller from mjkzz for firing flash during FRSP and second curtain.
https://www.mjkzz.com/single-post/2018/05/08/Flashes-Continuous-Lights-And-Flash-Triggering-Modes
https://www.mjkzz.com/single-post/2018/05/08/Flashes-Continuous-Lights-And-Flash-Triggering-Modes