Right. But you mean SEK , not SRK , ok ?

You don't need to flash EUX with ODIN, because SEK firmware can take updates normally via OTA , little later than EUX , but it's ok. If you are inpatient, you can flash EUX via Odin. But it is not necessary...
The next step is Samkey be compatible with your current EUX firmware... Samkey doesn't support later EUX firmware. I have done the CSC change in my EUX phone when I had the fisrt firmware, A7. Now , with the latest March firmware I don't know if Samkey is compatible. Officially, Samkey is not support the s22 phone in its page. You can try and if the process stopped means that you can wait for Samkey update or downgrade to A7 SEK or EUX firmware..
Hope I helped