Thanks for all the input. It has given me some fuel for brain consumption 
Many of your arguments are built upon the fact that the named Evoker can not cast divination spells as arcane user. The fact that the FAQ specially states that scrolls written by a wizard gone divine oracle can not be read by other arcane users does obviously not impress you.
Some has mentioned this Prc is irrational and pointless for that Evoker. Of course that could be the case, but I personally don't think so. If a text in divine oracle description says that most divine oracles are extremely adapted in divination spells, it does not mean that all are. This Evoker becomes a really poor oracle but that is the fun part of it.
Still, let us agree upon this until FAQ somewhere highlights this beyond shadow of the doubt.
So this Evoker takes 1 level of cleric to Mystra, chooses Magic domain which allows him to read all arcane scrolls (including divination arcane spells) and then ventures into the path of divine oracle at which time he gains access to all the domain spells and can write them down on scrolls for future use. I hope this will satisfy even the stricter GMs.
Thanks
Bouncer

Many of your arguments are built upon the fact that the named Evoker can not cast divination spells as arcane user. The fact that the FAQ specially states that scrolls written by a wizard gone divine oracle can not be read by other arcane users does obviously not impress you.
Some has mentioned this Prc is irrational and pointless for that Evoker. Of course that could be the case, but I personally don't think so. If a text in divine oracle description says that most divine oracles are extremely adapted in divination spells, it does not mean that all are. This Evoker becomes a really poor oracle but that is the fun part of it.
Still, let us agree upon this until FAQ somewhere highlights this beyond shadow of the doubt.
So this Evoker takes 1 level of cleric to Mystra, chooses Magic domain which allows him to read all arcane scrolls (including divination arcane spells) and then ventures into the path of divine oracle at which time he gains access to all the domain spells and can write them down on scrolls for future use. I hope this will satisfy even the stricter GMs.
Thanks
Bouncer