OSR Game Mashups: What would it be like?

A while back I wrote up a tiny table for shit and giggles, where two OSR-related games are mashed up. For fun I tried to flesh some of them out a little bit in trying to imagine what it might be like in term of setting and adventures:

• Flying Swordsmen + Stars Without Numbers: The Great Empire Under Heaven span all known space and maybe beyond. It is a large empire, where the rule of law, order and bureaucracy is supposedly adamant. However beneath this world of workers, peasants and magistrates is one of swordsmen, mercenaries, martial artists and demons. Basically, space Wuxia with maybe a dash of cyberpunk and transhumanism or space wuxia with space fantasy elements via the Codex of the Black Sun. Every single Wuxia cliche and tropes exist and is cranked to eleven but in a world of spaceships and super science flavored around Taoist and Buddhist principles.
• Godbound + Spears Of The Dawn: Depending how you play it, you could simply take the 'fantasy faux Africa' style of Spears (the same way D&D is implied to be 'fantasy faux Europe') and apply it to Godbound's own setting, meaning the Three Lands are actually a distant Realm to Arcem. More interestingly I would say one should play off the African fantasy and mythology aspect but crank it to epic levels using the Godbound rules in the setting of Spears rather than importing the setting of Spears into Godbound's own world.
• Flying Swordsmen + Mutant Future/Gamma World: Another Wuxia one, but rather than being set in ancient China or a future analogue it is set in a post-apocalyptic, mutation-ridden post-WW3 China. The lawless lands are a breeding ground for bandits but new martial art schools and sects are formed to compete and bring order. Like Fist of the North Star but in China with mutants.
• Mazes & Minotaurs (and Vikings & Valkyries) + Spears Of The Dawn: Ancient world massive crossover shenanigans where 'all myths are true': assemble an army of adventures from all the continents as you travel the world. Historically accuracy be damned.
• Astonishing Swordsmen & Sorcerers of Hyperborea + Carcosa: Your mighty-thewed barbarian and amazon huntress found this strange portal in the 'Caves of Zur Gartsar' and next thing you know you are on a faraway alien world. Could be a whole campaign or a single adventure side-trek.