buying a tripod

Try the area around rue St Boniface / rue E Solvay. There are a number of camera / optical instrument shops in the area.

https://www.google.be/maps/place/50%C2%B050'09.9%22N+4%C2%B021'52.0%22E/@50.8360693,4.3642247,20.38z/data=!4m5!3m4!1s0x0:0x0!8m2!3d50.836069!4d4.364434?hl=en

Alternatively try FNAC or Media Markt.

Sorry, that links no good, try this : https://bit.ly/2OtbvOm

You could also buy online. Unless the binoculars have a thread mount a special mount will be needed, such as the Monfrotto 035 BN Superclamp.
The head is also important.

Best gear shop in Brussel is PCH, Rue du Midi 147, 1000.

Foto Bert in Stockel should be able to help.
I have a spare regular camera one for sale if you are interested. Not sure what connector for binocs.