I dont think it will matter too much whether you complete your CPL & MEP on the DA's or some other aircraft, or even which aircraft you do your FI rating on.
Like the other guy said, go join a school that uses DA40's first, do your FI "apprenticeship" on these to get your initial 100 hrs / 25 sole sign offs to remove the restriction.
Your main consideration will be how to transition to ME instructing:
You will need 500hrs total, obviously you will need an MEP rating and ME CRI rating, plus also 30 hrs P1 on an MEP..... that can be the cost challenge. If you can get in somewhere that use DA42's you may be able to work out some kind of financial support from them if you commit to teach for them for a period of time.