Is there an alternative to a wireless bridge?

Yes,

Many zencontrol devices can be used to perform the function of a wireless bridge. These include

• zencontrol's range of Wireless sensors which include a DALI PSU. Ideal for installers looking to connect DALI-2 drivers in a room to the wireless network
• zencontrol's range of wireless emergency converters. Ideal for luminaire manufactures who also want to connect the intergral DALI-2 driver to the wireless network
• zencontrol's smart driver.

and obviously, the wireless bridge performs a similar function.