Christian Knigge also suggested following the He II / H beta region at higher resolution looking for RV variations. Here is 4 hour time series at 10 minutes cadence from last night with the LHIRES at R~2000 . Not sure there is much to see above the noise though (SNR in a 10 min exposure is ~50)
The average
and the individual spectra (rectified)
_20210721_068_Leadbeater.png)