This is experimental image: combination of long (5 min) and very short (5 sec) exposures in Ha and O3. 
It was done this way, since it is superhigh dynamic range target.
Some points: 

1. S2 does not work.
2. At least 5 min Ha and O3 frame are needed.
3. 5 min O3 and Ha will NOT burn center.
4. Center will be overexposed by stretching even with 5 sec O3 and Ha exposures. 

Processing:
RGB are combined.
Cropping for Ha, O3, Ha (5 sec), O3 (5 sec), Lum and RGB
DBE for Ha, O3 Ha (5 sec), O3 (5 sec), Lum and RGB. 
Color Colib for RGB
Blur and Noise XT for Ha, O3 Ha (5 sec), O3 (5 sec), Lum, and RGB
Star XT for RGB. RGB stars were kept.
Manual stretching (with HT) for Ha, O3, Ha (5 sec), O3 (5 sec), Lum, RGB, and RGB-stars. Note: RGB-stars will have fat blob from Blinking Eye, which should be removed by Clone Stamp. 

Combined RGB and Lum as LRGB
Combined Ha and O3 as Red-Green-Blue = HOO
Combined Ha (5 sec) and O3 (5 sec) as Red-Green-Blue = HOO (5 sec)

LRGB processing:
Mask LRGB with O3 (5 sec) with manually erased stars with clone stamp. This is critical step to mask only center.
Apply HDR Multi-Transform and change parameters until Blinking eye seen clearly in center. 
Local Histogram Equalization: Kernel radius of 40 and then 100 
Multiscale-median transform for sharpness; middle 0.3 setting. 
Curves: brightness is manipulated 
Mask off.
Done 

HOO (5 sec) processing:
Mask HOO (5 sec) with O3 (5 sec) with manually erased stars with clone stamp. This is critical step to mask only center.
Manually erase stars by clone stamp. 
Apply HDR Multi-Transform and change parameters until Blinking eye seen clearly in center. 
Local Histogram Equalization: Kernel radius of 40 and then 100 
Multiscale-median transform for sharpness; middle 0.3 setting. 
Curves: brightness is manipulated 
Mask off.
Make Lum. This is critical Lum for main HOO image

HOO processing (main picture):
Mask HOO with O3 (5 sec) with manually erased stars with clone stamp. This is critical step to mask only center.
Star XT, if it works. Masking of center is critical. 
Apply HDR Multi-Transform and change parameters until Blinking eye seen clearly in center. 
Local Histogram Equalization: Kernel radius of 40 and then 100 
Multiscale-median transform for sharpness; middle 0.3 setting. 
Curves: brightness is manipulated 
Mask off.
Add Lum from HOO (5sec).
Add RGB stars.
Rotate and crop.
Done