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Basically I was humouring the idea of a crossover where a Legion along with its territorial holdings, needed industrial base, etc... was transported to other Scifi settings such as Babylon 5, Star Wars, Star Trek, StarGate, Halo, Mass Effect, Alien, MCU, Andromeda, etc...

Which legions would most likely find it easy to tolerate Xenos and which would find it the hardest? And which would be the most practical about it?

Given what we know of the Heresy and its aftermath, both the traitor legions and the loyalists both still held humanity as having primacy over all species and saw xenos as scum that needed to be eradicated, even during and after the civil war. So by and large, regardless of what legion was transported over to whatever scifi setting, they would continue their perogative of kill the xenos.

However, assuming they were forced to avoid widespread purging by necessity, the ones most likely to work with them in the short term is likely Alpha Legion given their dealings and subsequent betrayal of the Cabal. Their focus on subterfuge and intel operations makes them less likely to charge in guns blazing like the Iron Hands or World Eaters would. Hardest to tolerate the xenos is probably World Eaters given how the Butcher's Nails already make them hard to work with for other allied Imperial forces, it would only be harder when they have beings they actively see as enemies basically baiting them to attack them. Close second would be the more puritanical Word Bearers, where as loyalists they would see xenos as an affront to the Emperor's divinity, and as heretics, unworthy scum that get in the way of the Ruinous Powers.

Probably the Ultramarines. Guilliman has actually worked with Eldar and has at least acknowledged that the Tau seem honourable.