Indeed many Omani Kattara have imported blades, both curved sabre type and straight 'broadsword' trade-blade type.
Ah! But all Shamshir and Kattara are Sayf, but not all Sayf are Shamshir or Kattara!
Although the "Shamshir" is a common sword type with many region specific variations I also don't remember ever seeing a Shamshir attributed to local production in Oman.
However, that said the slight Omani touches on these imported swords are still interesting and I'm sure would add a premium to Shamshir sold to Omani collectors.
I assume that you intend to have your silverworkers "Omanicise" some plain Shamshir emulating those you have shown?
These local re-dressings are interesting and it would be good to see some other historic examples of "Omanicised" Shamshir to compare the 'level' of re-dressing with the work on the two you show.