holly sht ... the price tag:

http://www.ebay.com/itm/Delta-2000-RD1A-Joystick-Amstrad-Atari-Amiga-Spectrum-Commodore-MSX-Schneider-/121861257635?hash=item1c5f7f39a3:g:gnsAAOSw54xUU42s

http://www.ebay.com/itm/Ram-Delta-Joystick-for-Amiga-Others-Tested-Working-/401054102639?hash=item5d60aff46f:g:AjkAAOSwd4tUK95o

A good looking German boxed Enterprise 128!

It is complete with accessories and program cassettes.

Fixed good price with post and package included to Europe, at least to Spain. 

"Not too good looking English EP128."

haha mintha az én gépemet látnám, agyon volt használva, koszos volt mint egy pc billentyűzet
na de a hűtőborda törése? az érthetetlen

I enjoyed very much a software speaking library the early Amiga computers had. I managed  the family business program to ask for data to my father  in "Spanglish"... much the same as Speakeasy seems to do.

I decoded the program and it was based on easy English rules, not directly on vocal sounds. Then, I planned to do Spanish rules for it, but that work is still undone...

A Spanish Retrowiki EXDOS clone. Very cheap, only 65 Euro.

The problem with this EXDOS only solution is that you still have a basic 128k unit. Your idea is better, with 1 MB memory the user doesn't need to open the machine. And Flexibridge for future expansion modules(yours).

You even can try a super EXDOS with overclocked WD1772 to manage DD disks... Ask Zozo.

And a bigger Rom to put some utilities.