I work in reexams and in my personal opinion, on the facts given, the rejection isn't warranted. I would not personally issue broadening rejections for correction of clear typos. Of course this opinion is worth what you paid for it. This type of thing just doesn't get appealed that often so I don't know if there is any authority on it (i.e. on fixing typos being broadening) but it just doesn't seem right, to me. The intended scope of the claim is clear, and fixing a typo doesn't change it, again to me.
I don't know what group this is in, but I wouldn't advise to call the SPE first. Everyone in the CRU is a fairly experienced primary and the SPEs aren't all that interested in dealing with issues like this if you haven't even tried to resolve it with the examiner first. It doesn't seem that you said anything about calling the examiner. Since you say 305 this must be ex parte, so you can call the examiner. Why not do so and see if you can resolve it with them, or at least figure out what they are thinking? I know some that are unresponsive like (often) in the regular corps, but generally the CRU people are perfectly fine with discussing their case with you. Maybe they will suggest language they like...while such language might not be your ideal, maybe it would be good enough for you, I don't know. Or maybe you won't resolve it and then you talk to the SPE, but I'd try the examiner first if it were me. Sometimes things are as simple as saying "Come on, really?" and they might say, ok. Your mileage may vary, but the CRU doesn't deal with counts or generally have the reject vs. allow Dudas/Doll like bias so you may get somewhere with the examiner.
I do note that Mr. Ivey's first paragraph is wrong, where he said un-doing the amendment would likely result in 112 1st and 2nd par. rejections...it would seem that un-doing the amendment would lead to your original claims, and those cannot be rejected under 112 in reexam...this would appear to overcome the rejection and get your claims confirmed, on these facts, though that might not be great as the claims may have trouble during litigation, so it's hard to say if that's a good or bad idea. I pretty much agree with the rest of his post.