Fernandeztv,
Best of luck to you. I understand where you're coming from. I trained several of those 300 hour FO's you had in India.
But, the problems you mentioned don't sound like they're derived from a "single-engine mindset." Sounds like piss-poor selection, and shoddy sim, LOFT, and CRM training. All understandable for an aviation market going from zero to huge in such a short time, with a regulatory body that has virtually no experience, and any warm body with a CPL could get an FO slot. You can get type-rated at any point (PPL or CPL) in coming up, but the standard for the type is still ATP standards. There aren't a lot of 50 hour or 250 hour pilots that fly to those standards consistently.
I think you better check Annex 1 again as far as your ATP goes. Special attention to the sections on "pilot in command" time required. Don't see how you can make that time if you can't act as PIC or log pilot-in-command time for anything but that 100 hours in the Cessna.