Customised email notification based on incident rule

Hi All

I have number of incident rules which are to produce Sev1 2 and 3 incidents. I need to amend the subject of email notification with some codes based on the particular incident role. then email is then sent to third party, based on the code used in the subject, different type of tickets are then created.

I am not sure what is the best option,

1- to work with email notification template and manipulate the parameters

something like below

--[IF RULE_NAME EQ "Sev1,Sev1 Target availability"]

Issue Sev 1

--[ENDIF]

2- if possible create a variable and use it in the email template.