Can I use official script for Yan-style regular script works and inscriptions?

Yan-style regular script works generally do not need official script.

Because it seems a little abrupt.

For ordinary regular script works, the inscription and postscript are written in regular script, running script or cursive script.

Most calligraphy works, inscriptions and inscriptions are running scripts or cursive scripts to distinguish them from the themes of calligraphy.