It is a caprifig.
Yes you can graft ,ficus carica on this plant especially if the leaves are very healthy,showing a healthy tree.

I'd like to try evaluate your black caprifig here for some breeding experiments. May I obtain a couple of cuttings from your tree? It does not matter to me that they are not dormant at this time, just some cuttings from last year's growth after removal of all leaves (but retaining buds). If you are willing to do so, email me using my email address of
h a r v e y c AT gmail.com

Thanks