>The thing is... what market do you cater? Because the fans of each country has his own favorite Nagai mecha. Spain is mostly Mazinger, France Grendizer and so on...
Well, the thing is that you would slowly focus on one group at a time. Groups like Dynamic Pro usually create multiple concepts and then go around to different people, introducing the concepts and giving them an idea of what they could sell.
They could come up with a Grendizer sequel for France, a Great Mazinger remake for Italy, and a Mazinger Z reboot for Spain. Just see what works best for each region and market to them.
As to who they could get for sponsors, each of these countries happen to have toy makers and normal product advertisers. I mean, hell, back in the day of Mazinger Z it was less about selling a toy and more about guaranteeing that the local soap manufacturer would pay to advertise his latest product during your show's time slot. This mentality is still quite relevant in Europe and the America,s so they wouldn't have to really do much beyond that.