Hi Chris,
Hello and thanks again mate.
I already have all of those that you mentioned. And in fact as I’ve mentioned I already re-packed the bottom bracket and rear wheel including the rear drum brakes.
And the good new is, today I removed the bottom bracket housing and dicovered there are several pins on top and sides to hold the mount in place. Once cleaned and put back in place it seems the noise is not there anymore. But still need to do some hill climbing test to see if the noise will get back. If it does, the only one I can think of causing it will probably be the freewheel mechanism in the flywheel.
Best regards
Orland