Persian shamshir in need of restoration

[MARW]

Hi everyone. I got a persian shamshir with an Assadullah mark not so long ago. The shamshir was in a terrible state and hence got it at a bargain price.

I intended to restore it and couldn't resist opening it up since there was a lot of active rust on the tang and inside the guard.

So far I have cleaned the blade, removed much of the active rust, and found that perhaps it was historically repaired before (the tang bands are welded).

Can you guys suggest some further steps? especially I am missing the pommel cap. Is there some way to source an antique one or someone might have one laying around and would like to sell?

I have tried etching it with coffee and it turns extremely dark but without any pattern.