Legend of the Five RIngs (L5R) has multiple editions; the neighboring nations are almost entirely ignorable in all of them. The Empire has no trade externally. it also isn't exactly united. 1st and 5th are the same time frame; 2nd, 3rd, and 4th advance the timeline based upon the L5R card game tournaments' results.
Legend of the Burning Sands was an expansion for the lands "north" of the Empire of Rokugan. It's essentially middle eastern themed.
Editions 1-4 use the d10's only roll-and-keep mechanic; edition 5 uses a custom d6's and d12's plus (rarely) standard d10's, with a different roll & keep variant of the FFG Narrative Dice Engine. If you didn't like WFRP 3 or FFG Star Wars mechanics, this goes to fixed difficulties, but still uses 2-axis results, and they're much more fully integrated.
My edition preferences, in order: 5th, 3rd, 2nd. 3rd is mechanically the most interesting.
Adventures in Rokugan: a weak presentation of the L5R setting with the key themes of L5R utterly absent. But it's apparently pretty good as a D&D flavor...
WFRP's Empire isn't the sole nation in the setting - in fact, it and it's neighbors are pastiches of Renaissance Europe... Bretonia is vaguely Franco-Norman, Tilea is Renaissance Italy, Kislev is essentially the Russian Empire (with the name being bastardized from Kyïv). And of course, the Empire is a pagan pastiche of the Holy Roman Empire (which was neither holy, nor roman, nor empire).
Knowing you (JD) do online only, the NDS games are probably not going to be productive, so avoiding L5R 5e (which is current) and WFRP3 (which is not) are unlikely to be good choices. So...
Arrowflight (either edition - but only 2nd is available electronically) is focused upon one kingdom and a period of civil unrest pushing towards civil war. Setting is renaissance, vaguely musketeerish in both tech and culture; it has semi-tolkienian species/subspecies - Elves, Dwarves, Orcs, "Earthfolk" (small species with fae overtones), faeries. 2e mechanics are 2d6+skill+att vs TN with margin mattering; a dice pool option is included attribute dice for each < (skill+diffMod), successes used in place of margin. I prefer 1e's dice pool - which works the same, but with the caveat that if 3 or more 1's are rolled, open end the whole pool, and if more than half are 6's, fumble; in both versions TN >6 gets bonus successes = (Skill+DiffMod)-5, and TN's <1 require 1-TN 1's to count as a success. Both editions are probably lighter than your preferred, but are fully skill based.
Warlock is a rules light inspired by WFRP. The setting's presented mostly through the mechanics and a couple maps. No attributes, skill driven, skill raises limited by current career. It mechanically looks like 4 parts WFRP, 1 part Dragon Warriors, 1 part Fighting Fantasy, 1 part Pendragon.
Talisman Adventures is set on a peninsula. It's standard d6's only, rules medium, some divergence in PC races, mechanically textured... It's skill driven, but class & level advancement. Skills boolean. Races include Humans, Elves, Dwarves, Trolls, Ghouls, Leywalkers, and in the expansion, Vampires and Minotaurs. It lends itself to silly, and to tactical in both gridded and non-gridded modes. The whole peninsula is essentially one kingdom. It can be played quite straight as well.
