You have a good eye Mikkel, yes the dished face is a distinctive feature of Egyptian Arabians. If you do go ahead with modelling one, avoid reference pics with an exaggerated dish. These (cartoonish IMO) features are a product of fashion in the show ring along with excessively thin legs. The legs should be slimmer though, just not overly done. They fit into your time line too with the Purebreds being re-imported to the UK in 1881.
And, whilst I know "something" , it's only what I picked living with a horsey type for 8 years and having a sister-in-law who worked at an Arab stud. Don't take it all as definitive.