Any way to import previous compass calibration values?

I have a large multirotor, 880mm. Its difficult to calibrate the compass, it so huge, orienting it to 100% in the on board calibration ends up being a nightmare where I usually bend antennas etc, not to mention having to bring my entire setup outside which is difficult. The on board compass calibration also hangs at 99%. Is there any way to import these values from a previous calibration? Or have it do it in flight? Nothing has physically changed on my MR, just did a firmware upgrade to 3.6.9 and reset the parameters. I saved the values before I reset, then did a compare, and used all my old values (I saw the compass ones in there) but despite all that, upon reboot it said prearm:compass not calibrated.