Earthworks M30 - mathematical cal file transform to get 90 deg cal file?

jhaider

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Preamp, Processor or Receiver
Monoprice Monolith HTP-1
Main Amp
Crown DCI 8|600n (LCR + heights)
Additional Amp
Crown DCI 4|600n (sides/rears)
Other Amp
Crown DCI 4|1250n (subs)
Universal / Blu-ray / CD Player
Sony 1100ES
Front Speakers
JBL LSR708i
Center Channel Speaker
JBL LSR708i
Front Wide Speakers
none
Surround Speakers
JBL CBT-50LA
Surround Back Speakers
JBL CBT-100LA
Front Height Speakers
Pioneer EX S-ic891
Rear Height Speakers
Pioneer EX S-ic691
Subwoofers
bespoke; Aurasound drivers (18, 2x15, 2x12DO)
Video Display Device
LG 55" OLED
Remote Control
Harmony Ultimate
Streaming Equipment
AppleTV 4K (current); Mac mini M1, Roku Ultra
Streaming Subscriptions
Apple Music, some video ones
Other Equipment
2ch system with B&O Beogram RX-2 tt with SoundSmith SMMC3 cartridge and Parks Audio Puffin phono pre, Apple AirPort Express, miniDSP SHD Studio and 10x10HD, NHT XdS sats, Velodyne SC10 flanking subs, ULF subs Aurasound NS15-992-4A in ~40L closed box and Tymphany LAT-700 in 35L closed box
I know this has been done for UMIK, but does anyone have a mathematical transform to get a good-enough 90 deg cal file for Earthworks M30?

I realize I could get a 90 deg cal file using John Reekie's method - but I'm lazy!

I have my M30's ECF, and Earthworks also supplied me a "generic" M-series 90 deg cal file a while back. However, out of OCD I want to account for my own microphone's FR variation while applying the HF adjustment necessary for 90 deg orientation.
 
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