Yes it is possible, you simple put 2 stratum addresses one after other.

For instance:

-wd 1 -r 1 -epool etc.zet-pool.eu -ewal gand.40954 -eworker gand.40954 -esm 2 -epsw x -allpools 1 -mport -3333 -asm 1 -dcri 4 -dpool stratum+tcp://us-east.siamining.com:7777 -dwal c8e0fdbc467eccfbd7e6fca389a2236d609f7d61fe7395993d1ca1797d02e6dfeda2a2c1a4fc.$rigName -dcoin sia -dcri 12 -allpools 1