Someone else mentioned just using a calendar client that can connect to different calendars.

I use Fossify to connect to calendars through Davx, which includes my Google calendar (configured it through DavX).

This way all entries remain independent. And I can filter my calendar view based on source calendar, and all entries are color coded (automatically) by which calendar they’re on.

I know it’s not exactly what you were asking for, buy it’s one way to approach it.