Pressure Bleed valve instead of Wastegate?

[Deezul1]

I am thinking of going to a 16cm housing without wastegate. Is there any way to bleed of boost pressure with an adjustable valve? It seems to me I have seen something like this a long time ago.

 

[illflem]

Here's a thread about it from last week https://www.turbodieselregister.com/forums/showthread.php?s=&threadid=34439