With the help of Source Han Serif (思源宋体), one can pseudo-encode some unencoded glyphs, such as the following Chinese character:
One can do this through the use of their IDSes (Ideographic Description Sequences) and the 'ccmp' (Glyph Composition/Decomposition) GSUB feature.
The IDSes are ⿺ 辶⿳穴⿰月⿰⿲⿱幺長⿱言馬⿱幺長刂心 (traditional) and ⿺ 辶⿳穴⿰月⿰⿲⿱幺长⿱言马⿱幺长刂心 (simplified).
How can we do that in LaTeX?
(Note: the IDSes may not display normally on your computer!)
More information can be found in Designing & Implementing Biáng and IDS + OpenType: Pseudo-encoding Unencoded Glyphs.

inputenc,fontenc) and allows for the easier implementation of fonts. – Huang_d Jul 08 '17 at 17:03