I would plant these out, see whatever survives and stick with Orion_metalheads plan, but after at least a year of recovery.
Nurseries understand what bonsai is, just not how it's done. And I don't blame them; the costs/benefits on bonsai are only worth the investment if you have a steady customer base willing to pay a little extra. Most nurseries don't have such customer bases and it's part of the reason why a lot of starter plants sold by bonsai nurseries are priced 40 bucks and up. You could get the untouched, raw material for less than 4 bucks a plant. I'm thinking that's what happened here.
So they'll send you material that everyone else gets with the idea in mind that you as a bonsai fanatic can make a bonsai out of it. And they're not wrong! It's just going to take a while.
If you in fact did pay more than 8 bucks a plant - I get them for 6 euros per pack of 8 - I would return them. I've been fooling around with european beeches for a few years now, and with that little roots survival chances are pretty slim. They seem to be ripped from the dirt, which is generally a terrible practice and should be called out at such. Back in the days I have received a bunch of plants like that and only a cedrus atlantica made it another year before succumbing. They basically have to regrow their entire root system, which is either too much for them, or puts you back another year or two.
Anyone more experienced would have more authority on them of course, but this is my experience over the course of 3 years.