If you got Unified Theory and Trick Magic Item (Arcana) could you use magic items from other spell casters.
EX – Scrolls, Wands, and Staves
indigochild said on this post that
(Does the "Unified Theory" skill feat have any interaction with the "Natural Medicine" skill feat?)
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"That you are using an action or skill feat.
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That whatever you are doing requires a Nature, Occultism, or Religion check.
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That the kind of check is determined by a magical tradition."
Unified Theory https://2e.aonprd.com/Feats.aspx?ID=859
Trick Magic Item https://2e.aonprd.com/Feats.aspx?ID=857