FP&A vs startup valuation firm

I am in a bit of a weird situation. I started with an "M&A advisory" firm that is relatively new. The deal flow is pretty small but the work that I did was fun, I really enjoy valuation work. I was just offered an FP&A role in a new department for a F500 bank and during the interview I asked them if this was going to be more of an accounting type role or actual finance. They not only reassured me that this was going to be pure finance but that it would be hard since the department is new and there are only 5 people working on the team. The pay for the FP&A role is great and this current firm I'm with can't afford that right now so I'm getting paid well below market. My ultimate goal is to get into DCM or PE, both are equally as exciting. So my question is could the FP&A role lead to DCM (the role has to do with fixed income products) or would taking it be a step back, despite the pay, from the M&A advisory job?