Hello Paolo,
Please leave it as is - IMHO it wouldn't make any sense to dress this Malay blade in Moro fittings. I also think this is a really nice piece - if Alam Shah doesn't grab it, send me a PM, too...
Perhaps Adni could comment on dating Malay kris? I'd guess at 1st half of 20th century with possibly later fittings. However, if this happens to be a presentation piece for a British officer which was well kept in a collection outside SE Asia, the blade could be older (and/or fittings possibly original).
Regards,
Kai