Well, they arrived! Some good news, and some bad news.
First, the good news. These laptops, come with an easily accessible M.2 slot on the bottom side. Just take out two screws, and remove the panel. There's an adjustable back-stop, for various-sized M.2 SSDs. It might also be keyed for a PCI-E one, but I didn't have one handy to test. (Or rather, I had one, but the heatsink would have been facing downward, and it wouldn't be able to latch down in that position without ripping the heatsink off.)
I used one of my several Team Group MS30 SATA M.2 128GB SSDs that I picked up at Newegg a few months ago for $17.99 +tax.
Installed it, booted to BIOS after powering-on, showed up as "SATA1". (BIOS showed six SATA ports! This seems to be a decidedly wide-open and non-gimped BIOS, a bit of fresh air for a laptop.)
Plugged in a Win10 64-bit 1909 UEFI USB installer, and booted to BIOS, selected the "BIOS Override boot" option for the USB stick, and installed Win10 64-bit. Note at this point, that the manual indicates Win10 "S Mode", which means that we'll have to escape that later on to get to "normal" Win10 mode.
The bad news. Short power cord (like two feet), and in the BIOS, it showed an A4-9120e with R3 graphics, and NOT an A4-9120 (15W TDP) with R5 graphics.
And I just got a setup error, OOBEREGION, had to "Retry". I wonder about these Team SSDs, I had some serious issues trying to get them to work with USB3.0 M.2 SATA SSD adapters, they wouldn't work right. Not sure if I got a bad batch of SSDs, or it was the cheap Chinese enclosures, or what.
Edit: Finally got it installed and booting off of my 128GB SATA M.2 (Team Group MS30) SSD.
Had some issues with the OOBE, had to tell it I didn't have internet, and then create a local user. I created one, went through selecting (rather, de-selecting) all of the advertising ID and voice-recognition and location data and stuff, and then clicked "Accept", and instead of following through with creating the user and booting, it looped back around in the OOBE to selecting a country and keyboard layout. So I did it again, with a user2, and same thing. So I powered-off, powered-on, was at the end of the OOBE, then it worked.
Not sure if that is because there's something funny about the BIOS/UEFI (serial and the like not "tattooed", since I didn't go through the original OOBE on the eMMC partition), or just glitches, because the laptop was REALLY HOT, from both charging, and running flat-out doing Setup tasks, and these Team Group MS30 SSDs not being the most reliable.
Anyways, this is the first laptop that I've ever felt, might actually be too slow to utilize 4GB of RAM. According to Task Manager, it has a base clock of 1.5Ghz, but run at 0.95Ghz most of the time. (Walmart page claimed 2.5Ghz.) Seems passively-cooled, no fan. Probably just an adapted Atom chassis.
Hoping that when Windows Updates finally finish, and AMD drivers get installed, that there might be some custom power-management / power plan settings that get loaded, ALA "Ryzen Power Plan" (although this is Stoney Ridge). I already clicked on the battery icon in SysTray, and clicked on "Max Performance".
Edit: At least, it does appear to be a "real" 1080P display (But ship / Win10 defaults to 150% scaling, so you wouldn't know it out-of-the-box), and it has a real SATA M.2 slot, which is an upgrade plus. Also, when I installed my own copy of Win10 to the SSD, it showed up as "Windows 10", and not "Windows 10 S". It doesn't appear to be in "S Mode" after all, thank goodness.