I wonder: can the charging bench on the Addon board (the Mk 2) charge crystals?
Addressing the question that one needs an MFE first, it is correct that one needs an MFE to charge a laser.
However, there is a pattern that you can build an inefficient setup in order to bootstrap your way into a better one:
You can charge your drill/chainsaw in a generator, but it will be slower.
You can have your workshop going directly off generators instead of buffering with a batbox.
You don't need diamonds to make a portal, so unless I am mistaken, one can even have a mass fabricator and not be able to craft an MFE.
In none of the above is it great. In fact, I shudder to think of how that massfab works on 32 EU or less at a time.
There is a bit of a resource bump one needs to get over right after the batbox stage, though. One can surmount it with some lucky mining and/or industrial diamonds, but one can have a laser and still be running off batboxes if one isn't careful .
So it would seem that a cheap, slow, and perhaps even inefficient means to charge a laser or other device might be welcome at this inter-tier stage. Something without an output, only charge 32 EU/t at a time, only have a batbox or less of storage, and only interface with crystals and batteries (not lapotrons). You could say that the output circuitry was reconfigured to interface with the crystal.