Question about `pages functions build` command

I'm using the pages functions build command, then deploying it through
_worker.js
(Advanced Mode).

1. The build command was bothering me about Node.js compatibility even though my
wrangler.toml
file has the required properties. I suppose that means this command doesn't look for a wrangler config file?
2. If that's the case, can I put my wrangler config file somewhere else when deploying so its service bindings are used?
3. If I'm using
_worker.js
, can I still use _routes.json to control when my advanced worker is invoked? The docs seem to indicate "no" but it's not totally clear.
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