Well - yes, but 2068 requires a hardware emulator (a cartridge) to handle ZX Spectrum programs.
Also - all of them send music to AY ports typical for ZX128. So it wouldn't work on 2068.
Considering that ZX Spectrum had a modular construction (something like modern PC that uses cards)
and keeping in mind that TK series of Spectrum is NTSC, You might take a look below:
TK90X:
(requires AY interface - might be from Lotharek, I imagine - http://lotharek.pl/product.php?pid=40 ).
Or TK95 Spectrum -
(Also requires the same interface of AY).
So maybe You'd have to chat with dudez from Brazil. Someone might have the device.
...and of course a CF-card interface (divIDE) -
http://lotharek.pl/product.php?pid=56
But there might be some special system for it, You'd have to ask guys on WOS about it -
http://www.worldofspectrum.org/forums/
The system 'on-board' the divIDE doesn't save, as it was supposed to be only a browser for games (tons of them, on Spectrum, all the most famous titles present - at least to 1993 or so).
Remembering about modules for the machine, the joystick (Kempston) module would be desirable.
But the modules are often combined, so people usually get
Joystick with AY chip -
or
divIDE with joystick -
Another thing is, Spectrum modification from PAL to NTSC should be rather easy, to some electronic type of guy.
What I found about Spectrum in NTSC countries is -
http://atariage.com/forums/topic/217088
in-the-us/
I don't have too much time at the moment but maybe also this might appear useful?
http://www.worldofspectrum.org/forums/s
post778723
Or not...?