Forward with Masking Blocked?

Coming back to Glide to see if I could use it after first testing a long time ago. I am finding the walls to this garden are higher than before.

I see embedding is blocked now, siting security as a reason.

I also tried forwarding a sub-domain [masked] and also blocked.

I quick search of this community finds this a highly requested/questioned function.

Perhaps some of you might be interested in knowing some ways to simply use the native Google Apps/Scripts to accomplish many of this without the need for Glide?

Kind Regards,