Jane Austen? I don't think so

I'm wondering how annoyed people are going to be by the language I'm using in my upcoming Roman Britain series. Not in the sense of anything offensive but it's purposely written as a cross between Asterix and Blackadder.
It seems that fans of historical fiction get very hot under the collar by anything perceived to be less than 100% authentic. Which I can understand.
The problem is very few readers really know much about historical linguistics & the actual language of AD 59 would be completely unrecognisable. Readers should look at Shakespeare, Chaucer and particularly early Anglo-Saxon without notes before complaining. And then don't.