Maybe use the Chamonix hood with a pair of 4X reading glasses? Not a magnification typically available at the local pharmacy...but I ordered mine through an optician for twelve dollars.
But yes...its nice to be able to move one's head around when evaluating wide angle focus - and for this I find an inverted black T-shirt to work great. Will upgrade soon...with a white T-shirt sewn on as the outer (reflective) layer - and a drawstring sewn around the large end - to hold it to the camera then release it to insert a holder and take a photo, and an elastic strap to help secure it to my head and keep it from admitting light around my face.
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