Bluetooth com hell

[Andrea]

It is a nightmare move an usb dongle bluetooth from one port to another and
try to
delete the com port previously used and reassign to the new "hardware".
I tried to delete com port from device manager (show hidden ports and set
devmgt... = 1)
Removed the hive entries in the registry...

Nothing to do, the new com port always start from the previous number + 1 ...

Anybody knows a link or a programmatic solution to safely remove the com
ports and avoid they
are seen as in use by the system?

Thanks
Andrea