First of all, I personally think the Vega is a poor system. And the portable
Vega + is worse as it has not corrected many of the flaws. These included - no
HDMI output, not enough keys and a poor selection of games. The Plus currently
has no way of using 
an external keyboard, vital for many of the public domain text adventures that
make up the included library. And several key publishers do not allow their
games to be distributed as they retain the copyright or are using the property.

A C64 Vega would hit many of the same problems without careful design.
The C64 DTV updated would be a better bet in the long run.

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