Where to put custom AActor editor functionality?

I have a object displaying text in 3d, this is a replacement for TextRender which I’m finding to be pretty inconsistent on iOS.

I’d like the text to display in the editor which requires a MID and a couple of render target textures. I can set these up in PostEditChangeProperty but this does not cover initial level load.

What in editor callback can I use post actor constructor (I’d like to use the editor driven variables for material, text, text color etc) to setup my custom data?

For the game I just create this data in BeginPlay.