@sundeep_s_ The below answers are from my experience with BLS Brampton I live in Western Part of GTA so close to BLS Brampton I did walk-in for Both SC and OCI. The suggestions are based on my exp. and my interactions with the people at BLS Brampton location counters. The staff were generally courteous and of course they do talk you into getting the postal service for return but I had politely declined in both the scenarios (SC and OCI). You can refer to my signature for further info.
1. Would I be able to apply for both Surrender and OCI at the same time or does it have to be separate?
They have to be separate you cannot do Surrender Certificate (SC) + OCI, You can only do SC + Entry Visa If you plan to travel anytime soon. My Advise is as soon as you receive your Canadian Citizenship Certificate apply for SC immediately as this will slowdown your entire procedure if you wait for your Canadian Passport instead. I have done the same applied for SC without Canadian Passport so would suggest the same to anyone applying for SC
2. Will I have to submit my original Canadian Passport along with Surrender/OCI? That will limit me from travelling so will have to plan properly for this step.
NOT Required to submit Canadian passport in both cases only copies required for OCI for Surrender not required at Brampton BLS
3. How long is it taking on avg for surrender/oci together?
For SC it was 35 days from Submission to Pick up. OCI is about 6-8 weeks after receiving SC as you will need to attach a copy of SC and Cancelled Indian Passport
Will update my signature once I receive OCI document
4. Long shot question, but covering all ground here. If I apply for OCI, and then have to go to India on eVisa, and OCI arrives here in Canada, will I have to exit and enter India to adjust status?
eVisa is not available to Canadian Nationals. You can only Apply for Entry Visa that would be 5-10 days for processing if you apply for 6 months duration anything more than that would take at least 4 weeks to process after getting your Canadian Passport you can apply with SC application receipt