I have myself designed a system which used non-linear multi-dial virtual meters. That was on a dot matrix LCD panel though, and the sub-ranges were customised to allow the operator to see how a system was behaving. People think all display ranges have to be linear to be optimal. Not so! Audi speedometers have the scale compressed above 100MPH. Having said that - Are you raving mad? I can just imagine what a doppleganger Dave Jones would say about the decade display. Anglo-Saxon expletives would be in full flow.
I'm afraid using an LCD 2x8 or 2x16 module is just too good an option to resist. Cheap, multiple sources (possibly thousands), low current, flexible, hackable (anything with an LCD text display is just asking to be repurposed). The top seller on Ebay at the moment (854 sold) is selling 16x2 LCDs for £1:82 INCLUDING postage!
I don't care if it is too big! Change the case! If you are going to use enclosure size to constrain the design so tightly then something (cost and functionality) will have to give. If a product looks like a cheap toy then people won't buy it, no matter how good it is. Each cent saved is another cent in Sagan's education fund, but only if the product sells. I realise the reasons for sourcing from major distros like Digikey, Element-14 etc, but if you are pushing the costs and are seriously looking at 1000qty then you need to look at the more direct distributors (Arrow, Avnet).
In my opinion, any PSU needs a real time current display, so having a display that reads current when you press a button is useless. I need to know how the current is behaving as I wind up the voltage, no matter what project it is that I am undertaking. By the time my brain has decoded which particular red/green blob is being displayed, something could already be getting toasted.
If you simply must go with individual LEDs, how about going with a logarithmic scale? 1/2/5/10/20/50/100/200/500/1000 mA etc. Charlieplex them to save pins if you have to. Concentric dials is way too confusing,