Thank you all for your messages.
I have experience working with titanium and I could make chain on my own (arc welder included). As happens with any hand made process, this cannot be cheap.
Reactive Metals sell a variety of titanium chains (thank you!) and I think that some titanium chain can be found on The Ring Lord.
Unfortunately it seems that Alma do not list chain... I find it hard to believe that there are no European titanium chain suppliers, any ideas?
PS. By the way amazing torque, @vladimirfrater!