You could go 21st century and get a cheap Chinese side focus scope for under £30.00.
Modern lenses, (The same material as modern glasses that are optically perfect and cost only a few £'s,) cheap and clear as many an expensive ground glass up to a silly price point.
They are lighter and a great entry point, when you get to look through something that you can see is significantly better it will be time to upgrade.
Until then don't get caught up in the 10% better is 10 times the cost.
You are shooting short distance in reasonable light conditions, no need for anything more than decent entry level.