If you wish to continue along the instructing path, then get your twin approval first. The reason I say this is that as a holder of a CIR, you automatically get IFR training approval with your Grade 1. The only reason you wouldn't want your Grade 1 is if you don't want to do Instructor School.
You really should focus on getting the approvals, because there's nothing worse than getting your students to the point where they're ready to move on to advanced training, only to have to pass them on to someone else.
Any employer worth it's salt won't worry about whether you instructed or not. Those who don't, make excuses for not liking instructors. But it's just that-excuses.
Many of my colleagues from instructing are scattered to the 4 winds: Mostly regionals and majors in Oz, and a few O/S. Instructing hasn't hurt their prospects much!