I can add these to the list, but there is already a system in place for those not in the list: when no country is automatically assigned, it checks the country of other vehicles listed with the same make & model, and uses that if all were the same.
And if no model is found, then it does it with the make if all models have the same country.
If the model is "unknown", then it checks across all models of the make. So for cases like Luxgen it should already work automatically. For cases like Kymco, it works only on models where the origin is the same for all; for example on the Freeway there is one with a different origin: https://www.imcdb.org/search.php?resultsStyle=asList&sortBy=0&make=Kymco&model=F- reeway (not counting the Freeway 100 etc.)