pro ATC who I would expect to advise of any conflicts between myself on a published approach and you on a DIY one.
Then you would be wrong. It's still class C where traffic information VFR to VFR is only given when possible and practical. Of course they will do their best but there's no guarantee.
What you can expect though, is the locals on their DIY approaches and departures, or their tasks within the CTR, to know the standard approaches and departures. So they know where you are likely to be, if you adhere to the published procedures, and they will look out for you if there's likely to be a conflict.