I don't know where Tamariu is but if close to Barcelona a good bet would be to give a call to Servisub. They are DIR divers but can do O2 and I am sure they will orient you about your rebreather needs since they serve other rebreather divers in the region.
SERVISUB
C/ Ausias Marc, 136
08013 Barcelona
Spain
Tel: 932324405
servisub@servisub.com
Ask for Eva, she speaks/writes English.
Steve