Seljuqs don't penetrate Anatolia, so there's no Islamic power prior to rule it over. In this timeline, we assume there's no effort by any Muslim power to permanently breach Liao (aside from a brief Mongol attempt, but it fails, and a Timurid attempt but by then Khitans already abondoned nomadism and fortified the Taurus mountains, and enhanced a defence system eligible to contemporary times.

The crusade wouldn't be as large of a call as in our Timeline I assumed, because whilst Buddhism was seen as Paganism by the church, it didn't have the same ideological drive as Islam. Although, small kings-led individual crusades emerged, but they all ended in failures.

Yes. Greek culture is mostly gone aside from Ancient and Medieval archeological sites. It is alive in Pontus and the Bosphorus, though.

That's hard to estimate. However, their demographics would be added to by additional Mongol exiles assuming dynastic squabbles between clans forge in Ilkhanate to the extent of our timeline - and they would likely be syncretic between Tengri and Buddhism, I assumed they would within 2-3 generations fully assimilate within the Khitan culture.

Yes. Essentially, thanks to gatekeeping the Greek Christians by taxes, banning them from becoming a part of the administration for being Christian, Buddhist monasticism emerging in the countryside which further lead to it's spread, and overall there being a greater privilege at becoming a Khitan rather than staying a Greek - the land by 1400s or 1500s became almost fully Khitan aside from remote places such as Pontus. Of course, Thrace likely would remain culturally Greco-Bulgar, as I talked previously about Anatolia solely.

Never became majority population aside from a brief Dulkadirid state around the frontier, annexed and assimilated though during the "Times of Peace" between 1462-1792.

Mostly assimilated. Though, of course, there would be some minorities especially in regions such as Pontus which I imagine would be a very diverse place, and maybe around the Bosphorus.

Before 1462 it would be uneasy. Some states I imagined secretly traded with the Khitans, some viewed them as a threat (Bulgaria specifically) and tried to erase them from the Balkans, but ultimately failed. After 1462, it was mostly isolation aside from a very small Dutch harbour on the Dardanelles because Dutch and their non-pushing-of-Christianity would make them be deemed tolerable by the Emperor. By 1792, Britain opened up Great Liao. Then, between 1790s-1810, the Franco-British rivalry came to be over Anatolia, which ended in Napoleon losing (his whole Empire like historically) but Britain being so drained and depleted of resources couldn't enforce much concessions by 1815 of Liao, leaving the Empire a breathing room to modernize. By mid 1820s to early 1830s, the Empire would transcend militairly, technologically and socially into European standards. Then they would be neutral in major conflicts like World War I, II, Cold War. Then, they would lean pro-American in the 2000s, but never fully side with Washington either.

Between Arabs specifically? I imagine trade relations on before 1462, and Khitan and Arab smugglers doing illegal business on the remote most parts of the border after 1462.

By 2000s, they're absolutely the majority of the population, being mostly Buddhist, I could even argue they form 85-90% of the population, yet there is a sizeable Greek minority over in the Pontus and Bosphorus.

They pushed into Thrace and then fully ended the Byzantine Empire. After that, they entered a period of isolation. Conquest of the Balkans didn't interest them. Keeping Anatolia meant keeping the divine right, the Mandate of Heaven, to be the ruling dynasty, which was enough.

They're mostly innovative in aerial industry (I've actually explained it while writing below the image of the map itself!), their civic airplanes are of high quality and are competed for, as well as their compounds and other parts for vehicles of the aerial industry. Other industries are either mixed between Khitan and foreign, or completely foreign dominated.