A basic manual radio trigger can work for this setup: transmitter on the Fuji X-Pro1, receiver connected to one Bowens light’s 6.3mm sync input, with the other two firing via their optical slave cells.

The key things to check are:

• The receiver must support connection to a 6.3mm sync socket (or use the proper sync cable/adapter).
• The trigger must work correctly as a transmitter on the Fuji X-Pro1 hot shoe. Some manual transceivers were designed mainly for Canon or Nikon bodies and may not switch properly into transmit mode on Fuji.
• The monolight’s sync voltage should be within the trigger’s safe limits, since some radio triggers may not tolerate high sync voltage.

An alternative is to skip the radio trigger entirely and trigger all three monolights optically by firing a speedlight on-camera, bounced at the ceiling or aimed toward one flash head if needed.

So: look for a simple manual radio trigger confirmed to transmit from Fuji hot shoes and connect to a 6.3mm sync port, while verifying sync-voltage compatibility.