Could you send me a message if your bx-4's are still for sale? I don't come on this board very often, although I have bought a couple things, and I can't send PM's to anyone.
I wouldn't get too caught up in what scope brands offer it direct. There are custom ballistic turret makers who will do custom dials for a number of different brands - including brands that don't directly offer custom turrets themselves. Just google custom scope turret or something similar.
Ignoring real time environmental conditions (i.e. not running calculations in the field) is a sure fire way to miss or wound animals. Cds and it's ilk are a disgrace.
There are great, free, ballistic calculators that you can run on your phone almost instantly. Not to mention integrated systems in higher end rangefinders.
Free. Just wrap in tape color of your choice and mark it according to the clicks for your data. Ive done this for years. Works great. Cost about a penny to change it.