[SPDK] Spdk nvme CLI - block device

Hi
I tried to understand if nvme CLI based on spdk-1.6 can somehow generate a block device without using the nvme fabrics kernel module.
I managed to add tcp support and connect ,but then the code goes to the kernel module and no block device was added.
In general , I know that it is possible to create block devices which are implemented in user space (for example with nbd) .. and I know spdk has block device layer..
Does someone think that what I did is somehow possible ?

The motivation for this is easy host installation without the requirement to replace kernel or application changes.
I'm aware there will be a performance impact..

Thanks
-gili