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@Rik_Van_Looy
The centaur you've shown above has flanges
The Miche primato and various other types do not have flanges.
with a flanged Bottom bracket It's not just the friction in the thread that holds the bb cups in the shell, it's also the force between the flange and the edge of the shell, so if you have a BB that works loose, it's often a good idea to clean and grease the threads.
PTFE tape is used to reduce thread friction and enable a greater clamping force.
I think it has to be worth a try in your case - fit the bb with plumbing tape and take it for a ride round the block and see if it comes loose....