On the SAR, you de-bolt the entire top rail, loosen the barrel nut, and remove the cocking unit. All in all, it was more screwing/unscrewing, pushing and pulling, and clamping into a vice block than I was comfortable with on that platform, as it involved trying to get a lot of parts perfectly right, over and over again, to not risk destroying parts that you can't just go and order replacements for like on an AR or 10/22.
I also have an accessorized and rail-ified SAR, which complicated the changeover due to the presence of even more expensive stuff. YMMV
The X95 shouldn't require removal of the cocking unit, I wouldn't think, but removing the rail, etc. would be the same.
Not to say it wouldn't be an awesome dedicated SMG platform. If HPA passes, I will heavily weigh selling off other things to buy a dedicated 9mm to suppress with that Ratworx/Manticore rail setup.
That being said, I have also read a number of people who converted to 9mm and are so pleased they will never convert back. But in my way of thinking, there are a large number of other dedicated 9mm systems that I would consider, which are purpose built and sized/weighted accordingly. There are not as many 5.56 systems that are as good as a Tavor or X95 for my purposes.
This is my opinion, yours may differ. But in the end, guns are fun, and I think variety is the spice of life. Now if I lived somewhere with registration and practical limits on the # of serialized items, the conversion suddenly holds much more value.