Not sure if I can answer 1, but for 2 & 3 see link below.
I was exactly in same boat as yours, but when I looked at Visas (which are faster), are suspended right now. Its eTrourist visa. Entry visa is another one I think (
https://www.blsindia-canada.com/entryvisa.php) but when I checked the fees, it was only about $100 less then OCI card so I am now surrendering the passport and applying for OCI at the same time. Its just that the processing takes longer than visas but OCIs are lifelong (may have to update information as it changes).
In previous post by "
amyn27" it took less than a month for surrender & OCI together. So I am hopeful it can be done.