Decide the bacon job: crisp topping (needs browning), flavor base (needs smoke/salt), or baking mix-in (needs salty richness).
Match the substitute using the ratio: use 1:1 for meat swaps; if using the flavor-boost approach, start at ¾ of the bacon amount.
Prep for best texture: sear/thin-fry most substitutes; for pork belly, render first, then crisp; for smoked pancetta, fry briefly for curl.
Adjust seasoning last: taste after cooking and add extra salt only if the substitute is unsmoked or drained.
Use timing: add crisp pieces at the end; add crumbed/seared bits during the last 2–5 minutes for even flavor.