connect flukso pulse port wireless with a (watermeter) sensor (2 wires)

I have a small issue with a watermeter sensor (Elster PR6) connected to a Flukso v2 pulse port.
The distance between Flukso and the sensor is >25 metres and is laying on the ground while testing.

I could camouflage the cable in the ceiling together with a couple of electric cables or...
Try to connect the sensor and Flukso port 5 by wireless or...
Buy a 2nd flukso and put it near the watermeter.

Welcome any advice/ideas.
Marc.