I don’t think you would ever want to skip the sample process and go straight into production. There are many reasons for this, most of them will become evident the more you work with different factories.
A sample room is sort of like the factory brain, in some cases they can offer decent advice, cost saving measures, they can show you how good or bad the lines will look when lasted. Some materials can x-ray more or less than you expected, sometimes things look great on paper and terrible when made and vice versa. Powder coating a last you can miss a lot of this. At the same time when you’re sampling you can grab some materials from the marketplace and begin trying new colors, materials, textures etc…
As a go between from paper to production the sample room serves as a liason to quality control type issues. My rule of thumb is that the sample room will be ~10% better than production line. Knowing where you’ll stand beforehand is essential to weeding out good and bad designs quickly. I’d rather make a thousand dollar mistake than book 50k pairs and find out they look terrible and have it cost 900k + business relationships.
Doing a mock up on a last isn’t something that can be shown either. Powder coat the last put it in a suitcase with 20 others for your line and ship them across the country and back, I’ll bet (and I’m not much of a betting guy) they get pretty scuffed up. Now do that 10 more times and you’ve got about a seasons worth of travel. It just wouldn’t be cost effective. Besides if you are working with a factory, why not let them get it as right as possible? Cutting dies have to be made, materials checked and ordered, all this stuff takes time anyways I don’t think you would gain much.
Between production and retail a lot happens. If you mean the ordering and shipping dynamic, nothing too complicated. Basically they place orders with you, you let the factory know then the factory sends you an ETD, you haggle over this to get it for your customer ASAP. The shoes get made, shipped to your warehouse so you can do a spot check if you’ve got the time, then shipped out. If the order is big enough and you’re confident in both factory and buyer, you can arrange with them to ship direct from the delivery port. If you’re going to do that, you should have your developer send you a few pairs pulled from the production line just in case anything is wrong.
As for doing shoes in the Eurozone I was talking to someone a couple weeks ago and he mentioned doing small runs of casual injected molded sneakers in Spain and Portugal. We did not discuss much beyond that but he had success with it.
EITHER WAY, I hope it works well for you!