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Well, I've never worn an appliance like this and nor am I a dental professional. But I am not sure why this should have an adverse impact on oboe or flute playing, since apart from the molar bands it would be entirely to the lingual side (the tongue side) of the teeth. As to the bands, plenty of folks do well with wind instruments even when braced, and even when those braces include bands. But why not take a look around at postings online from people who have worn an RPE - in many respects this device would be a similar experience.
By the way, when you said cross-bite I wondered if the upper arch is also narrow? That made me look back to your original post and realise perhaps you meant a pendex not just a pendulum - the pendulum just moves the back teeth distally (that is further back), whereas the pendex also acts as an expander - it can widen the arch.
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