Transparent Ethernet Bridge with In-Band Management

hi,

i have the following scenario:

location A:
Cisco Catalyst connected to Licensed link passing all traffic on a 802.1q trunk transparent to location B

location B:
Cisco Catalyst connected to Licensed link passing all traffic on a 802.1q trunk transparent to location A

I try to have a ROS backup for the licensed link that can pass the 802.1q trunk transparent AND which would allow to use vlan 100 for in-band management of the ROS devices. The ROS devices are configured as WDS AP and client, nstream enabled. I can pass traffic that is on a plain ethernet no problem and the ROS device bridges without issues. If i try to pass traffic as a 802.1q trunk it wont work. Also tried to have a vlan interface on the ROS device bound to the bridge and do in-band management that way which also failed. how can i create a TRUE transparent bridge for the 802.1q trunk AND do in-band management via vlan 100 also in the trunk.

example for the cisco interface config on the corresponding ports:

interface FastEthernet0/3
 description Example Config
 duplex full
 speed 100
 switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 1,100,110,111,300,400-408,1002-1005
 switchport mode trunk

Kind Regards
Jan