https://www.youtube.com/watch?v=wbSwFU6tY1c

As one of the world's most powerful operational rockets, Falcon Heavy can lift nearly 64 metric tons (141,000 lbs) to orbit.

https://www.google.com/search?q=lifting+power+of+falcon+heavy&rlz=1C5CHFA_enHK1009HK1009&oq=lifting+power+of+falcon+heavy&aqs=chrome..69i57j33i160.5567098299j0j15&sourceid=chrome&ie=UTF-8

Falcon Heavy's first stage incorporates 27 Merlin engines across three aluminum-lithium alloy rocket cores containing liquid oxygen and rocket-grade kerosene (RP-1) propellant. Falcon Heavy generates more than 5 million pounds of thrust at liftoff.

https://www.google.com/search?q=fuel+of+falcon+heavy&sca_esv=d475869e241db201&sca_upv=1&rlz=1C5CHFA_enHK1009HK1009&ei=CODrZevCCrmp2roP3M-tCA&ved=0ahUKEwjr5tLZpuaEAxW5lFYBHdxnCwEQ4dUDCBA&uact=5&oq=fuel+of+falcon+heavy&gs_lp=Egxnd3Mtd2l6LXNlcnAiFGZ1ZWwgb2YgZmFsY29uIGhlYXZ5MggQIRigARjDBDIIECEYoAEYwwRIwxtQ9RNYuBlwAXgBkAEAmAF_oAGpA6oBAzIuMrgBA8gBAPgBAZgCBaACuwPCAgoQABhHGNYEGLADwgIGEAAYBxgewgIIEAAYCBgHGB6YAwCIBgGQBgqSBwMyLjOgB5IL&sclient=gws-wiz-serp

Are you sure that even the first stage of LM-5 uses LOX + LH2?

The new generation of Long March rocket family, Long March 5 and its derivations Long March 6, Long March 7 and Long March 8 use non-toxic LOX/kerosene and LOX/LH₂ liquid propellants (except in some upper stages where UDMH/N₂O₄ continues to be used).

https://www.google.com/search?q=propellant+of+Long+march+5&rlz=1C5CHFA_enHK1009HK1009&oq=propellant+of+Long+march+5&aqs=chrome..69i57j33i160l2.5567693343j0j15&sourceid=chrome&ie=UTF-8

China has LOX/kerosene powerful enough to be used as first stage engines. Maybe, China could just use all LOX/kerosene engines for the first stage(s) of this bundled rocket!