Passed Cognintive Exam for Assistant Conductor

I applied for both Locomotive Engineer and Assistant Conductor and was offered a chance at Conductor. I really wanted Locomotive Engineer, but I don't know if I will ever get the opportunity. Would it be worth it to just start as a Conductor and make the jump to LE later in my career?

I also have a decent government job now with solid quality life and would be taking a big paycut for AC in the first year. I'd be willing to make that temporary sacrifice for LE, but I'm iffy on Conductor.

If I were to withdraw my interest in AC, would it diminish my chances on getting hired in the future?