Could Alternate Spell Source be used to fox Ur-Priest>

[atemu1234]

Feat Wording:

Alternative Source Spell
Type: Metamagic
You can prepare any of your spells as either divine or arcane.
Prerequisite: Ability to cast both divine and arcane spells.
Benefit: You can choose to prepare any of your divine spells as arcane spells or any of your arcane spells as divine spells. An alternative-sourced spell uses up a spell slot from the class that normally grants the spell. Such a spell is prepared normally. An alternative-sourced spell is cast as if your caster level were 1 level lower. For example, a 1st-level cleric/6th-level wizard casts a divine fireball as a 5th-level wizard.

So my question is, can you use that to prepare cleric spells as arcane spells, and avoid worrying about losing them from being an Ur-Priest?

[Extra Anchovies]

From the Ur-Priest's prereqs:

The character must have no ability to cast divine spells.
"No ability" is the key phrase here. Even if you have Alternative Source Spell and prepare only arcane spells, you still have the potential to cast divine spells (e.g. by prepared divine spells tomorrow). So no, it wouldn't work.