Here is an idea lifted from the fNW contract.

Take the blockholder without a block language and apply it to DL reserves using SC and LC.

SC eligible gets 75 hours guarantee.

LC only (no SC) 68 hour guarantee (insert your version of guarantee here).

Would obviously have to be some language about minimum number of people required to be eligible for SC blah blah...

There would be other considerations as well, I'm just not going to list them all here since its a hypothetical.