[1.20.1]How to create specific model block without injecting custom models?

[KaxelDreamhack]

Im trying add to block a hole in center, just a usual block and in center of it on up side, there is should be a hole. I tried to add it via BlockModelBuilder, but its not working. Problem is that it only can change block size outside. I tried it to do with VoxelShape and its working, but its has been on server side and looks like its just changed collision shape, but for client, there is a texture covering this hole. I tried to use:

base.renderType("cutout");

and removed some pixels from texture. I thought its should work, but game optimization makes block inside looks transparent. So, only custom model?

Edited February 13 by KaxelDreamhack