It's also possible with trial and error to adjust the compensation of the saddle for intonation, but if it's not broke why fix it? It seems like the best upgrade would be to experiment with string combinations which suit your playing style. The stock Svarez may or may not be the best. I do think the low bass string might be improved
Maybe try the La Bella 8 string set...it's reasonably priced. I use a modern Tusq saddle but don't think the bone is inferior...it's just that the stock bone saddle was lower for flamenco but the higher height Tusq gives me some better sound.
Modern saddle materials are no better or worse than traditional bone material. It's simply a matter of how the saddle is setup.
Tusq saddles cost more than bone, but they aren't nearly expensive as the black diamond 99.99$ wonder saddle...Honestly I'm not buying it, or giving the manufacture any praise. It's absurd to suggest that these wonder saddles do much of anything.
The reason a luthier charges average 60-80 dollars for nut's and saddle setup is mostly because of the trial and error involved in getting intonation as good as possible. Before you commit to any nut/saddle setups you should first find the string gauges you will be using. Only then can the nut and saddle be setup to it's best performance.
Inspect the saddle slot with the strings loosened up. Does the saddle fit securely...is it glued in place? Some budget guitars such as Ibanez will glue the saddle in place. If so you can carefully use a soldering iron tip to gently heat the glue, or epoxy type bonding material and the nut should pry right out.
If it is not glued in place check it for play. It should slide tightly in tightly. There should be little to no up and down play. It should also firmly slide in with some resistance, if it glides like butter than you should make a new one which fits snugly.
It's entirely possible that the guitar is perfectly setup up for the stock Svarez strings, and if you like em...well no sense in fiddling around.
What I'd really love for you to do is shellac the top
You said you want to pimp the guitar out. I really think the Garnet toned shellac would make the guitar look superb...imagine a lush amber hue in contrast to the Mahogany back and sides.
You could mask off the back and sides and only do the top...get a bottle of 190 proof neutral grain alcohol, and dilute the flakes. I suppose you could get entirely inebriated and shellac the guitar at the same time
But seriously man, do the Garnet shellac flakes and the top will look gorgeous.