I never accept a job offer unless I can justify to the employer that comes after the employer who made the offer why I took the offer. I'd rather say that I took the opportunity because it was a great, career enhancing opportunity but I don't always get what I want. I make no apologies for taking a suboptimal offer if I need the money - in this case, the justification is what it is and I move forward from there.
Your choice at this point is between taking a suboptimal possibility or being empty handed. I had friends in the acting business who had to decide on a daily basis what they had to do to make ends meet and have food to chew on while auditioning and hoping to get that groundbreaking role. Wanting to live your dreams can come at a cost.
You have to determine for yourself which makes it harder to get back to your former level: taking that suboptimal opportunity or taking nothing at all. Or maybe taking something that's totally out of your field. My attitude is that as long as you have money coming in, you have options. If you have no money coming in, you have no options. However, I am not you and my attitude is not necessarily yours.
If you accept that offer, you will have to come up with your own justification based on the full picture of your preferences, priorities and circumstances, none of which we know anything about.