I’m considering using a new tiny LED matrix screen that should be easier one the eyes. I have designed it on EasyEDA.com to print on JLCPCB.com, although there are a few issues my design. I’ll use their SMT assembly tool to have it come assembled, which starts at £5. The only problem is it will have 16 wires going to a shift register then to the raspberry pi (Or Arduino), so, it may not look great at first.
I also will not be able to make it transparent, but if I put it at the corner, it won’t obstruct your view too much, which also means I can use a simpler magnifying lens design