Voynich through Phonetic Irish

[oshfdk]

By the way, since there are examples of medieval Irish manuscripts in this thread, maybe Irish should be included too when running statistical tests and making possible decoding attempts. Could anyone help with the following questions?

1) Generally how often was Irish used for manuscripts in the XV century? Are the known medieval Irish manuscripts a rare oddity, or is there a lot of them?
2) Was Irish usually interspersed with Latin in the Irish manuscripts?
3) Is there an easy way to get a sample (ideally ~4000 words) of digitized Irish with the ~XV century spelling? (a text file, not only images, but having both text and images would be perfect)
4) Are there any known examples of medieval ciphertexts in Irish?

I believe these questions are on topic in this thread anyway, since they are quite relevant to establishing the plausibility of any proposed Irish solution.