You can still bridge before going to CMHC and there are approved lenders that can be taken out by a CMHC-insured mortgage.
If you are planning to bridge, you will likely need to plan for an interest reserve (IR). This is when the lender requires you to pay some portions (sometimes 100%) of the loan interest upfront. This ensures that payments are covered, mitigating their risk.
Like anything a lender propose, IRs are negotiable and will vary depending on the perceived risk (operator, market/location, business plan, amount, length of term, etc.)
Before working with a bridge lender, just make sure that they are an approved CMHC lender and can be taken out directly by a CMHC-insured mortgage.