Flying wise, if you're good (and take the flying seriously) it isn't going to be a hindrance to future streaming - EFT isn't a long course and depending on how much flying you can do on the UAS, you can enter a streaming board with 50-100% more flying experience than your non UAS peers.
On the flip side, a UAS graduate who completes the core syllabus on the UAS within a certain time of starting EFT will do a syllabus which is 10hrs shorter!
Interview wise - treat it as you would an AFCO filter/OASC interview and give a competent performance and, in my experience, you'll be ahead of at least 75% of the other candidates!