It was once possible with a very old insider preview version to create starter. All windows 10 sku's can easily be activated with a free HWID, specially Home + Pro (and their N versions) and Pro-WS.
I snagged my ISO from BA, it's not the latest version though & just burned it to a DVD. I installed in Hyper-V fine. Wouldn't activate though as I had no key & no activation tool apps would run in 'S'... that's how the W10 'S' was then, assuming that is still the way it is. I had no problem updating to the latest version back then, then one day it just turned into a Pro version but was still broken w/ the 'S' features.
Remote Server is a Client SKU, used for “personal session desktop” collections, in RDS deployments. You still need WS2016 as RDCB and RDWA, but can now use latest client version instead of using full server OS for single-user-owned terminal server. Depending on licensing can be a nice kick to VDI, if doesn’t require SA from each client. Note: personal session collections can be created via powershell only
Windows 10 Starter is not going to be free. It's a leaked edition that can be activated because of a bug in activation servers and probably it will be never released.
It suggests that Starter is the smallest in footprint, unlike other SKUs. Well, I am struggling with Client as Server with customized Server Roles and Features now. Have a good day.
All Windows Client Editions are built upon Starter (hence the name) since Windows 8 just check C:\Windows\servicing\Editions\EditionMatrix.xml C:\Windows\servicing\Sessions\Sessions.xml it was and will be never released as acual complete edition it's only side effect of UUP dump to offer some unofficial editions packages