s'accordent à dire que ...

[alan gould]

I believe this was a dictionary entry: 

Les spécialistes s'accordent à dire que ...      the specialists agree that... 

I'm wondering if I could omit "à dire" and just say "Les spécialistes s'accordent que ..."  Prior to encountering this, I would have said "sont d'accord que..."

merci d'avance  

[Robert]

s'accordent à dire que ... is an idiom.
I suppose your other choices are alright. But idiom is best.

[Chantal Savignat]

Hello Alan.

No you can't omit "à dire",

the first meaning of the sentence is "Les spécialistes disent ... ".

A stronger meaning could be added "Tous les spécialistes disent ..."

and for another stronger meaning "Les spécialistes s'accordent à dire ..." = Tous les spécialistes sont d'accord pour dire  ...

but you could change "à dire" by  "à penser", ...

"s'accorder" or "être d'accord"  about something "dire", "penser", "faire", ...