There are some vga boxes small enough to fit into a dreamcast but they would be a tight squeeze and would still require soldering and such so even then its not a job for a complete novice.
I doubt their are any commercial vga boxes with this "half-vga" mode that allows a person to play non-vga games in vga mode but it may be easy to make one do this, requiring more soldering and the right product.
If you plan on buying a vga box then your best off just leaving it alone, I would imagine that it would be just as challenging to place a commercial box inside as to make one to place inside.
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