Connecting non-stacked switch to stacked Force10

We want to add a new network for ceph storage and use stacked Force10 Switches as core switches however Force10 has limited number of ports. That is why we came up with a theory, that I tried to draw below, extending the amount of ports by using switches in dummy mode.

NRS: non-redundant switches

F10                     NRS     Servers
A,Port40 (Subnet A) <-> K  <->  Server A,Port 1 | Server B,Port 1
|
B,Port40 (Subnet A) <-> L  <->  Server A,Port 2 | Server B,Port 2

So with this design, what do you think can go wrong ? Or are we trying to build something really bad ?

Thank you