thanks for the inputs and perspectives, All.
a couple of weeks ago i had ordered a loupe from amazon (Amazon.com: Ymarda Optics 3.0X Binocular Loupes Surgical Loupes (Black Frame 3.0X Magnifier with Different Working Distances) (L (440-540mm) with Black Frame) : Industrial & Scientific) but when they came it was obvious the working length was going to exceed my arm's same, so back they went.
i checked with my dental hygienist and she gave me the name & number of the company which furnished hers. calling them, it became apparent unless i was going to use them professionally it would not be a practical investment (starting at $1,200 US and heading upwards with any modification). but after explaining my conundrum, the lady suggested an optometrist making some higher powered readers, so that's the route i'm on now.
i had some prescription graduated lenses which i never could get used to, so i called Eyebobs and asked if they could swap lenses in the same frame. so for under $60.00, i'll have a pair of 3x magnifiers.
we'll see how those work before diving into a more sophisticated solution which my not be necessary.
thanks again for the feedback.