the best solution is to replace that linksys with a cradlepoint cellular router like the MBR1000

you can tether the mifi via USB cable to the MBR1000 and then use it as the house router.

the printer you have will connect to the MBR1000 via ethernet connection.

when its time to hit the road, you just unplug the MiFi from MBR1000 and away you go.