Hi ak,
For the CTC Wings scheme you need to have the right to live/work anywhere in the European Union or Switzerland. For most of the airline schemes this needs to be the case as well.
From the top of my head, I think the Qatar Wings MPL is the only airline tagged scheme that doesn't have this nationality restriction.
The Takeoff integrated scheme also has no nationality restriction however this doesn't include the Airline Qualification Course and entry into the employment hold pool.
Best get onto the website and start reading through the different training programmes
Cheers!