Firstly, many others will tell you to have a look around this site for answers !! A quick look in this forum answers your first question re IR before CPL,
here . In a nutshell - not a good idea.
a) Tomahawk counts in full. Vigilant (assuming it is the mil version of Grob 109) also counts. Not sure about the gliding - doubt it.
b) You need 50 hrs cross country before the IR test. If you didnt youd most definately struggle with flying a twin, IFR in airways , and struggle with the IR !
c) You seem rather confused. I belive you would normally do the ME class rating before the ME IR. The ME rating has nothing to do with IMC flying. The IMC rating is a lower qualification than the IR and hence a priveldge of the IR (and also CPL).
d) You can do it at either. Why not do it before the more expensive CPL training ??? You may need more than 25 hours, but the amount more may be less if you have more experience. I'd be tempted to wait until 165 hrs or so before starting.
e) The course is only
minimum 15 hrs. However, you may have got this reduction by spending more money on more expensive twin IR training.
Hope this helps.