Using RB with Serato's SL3

So I switched from Serato to RekordBox and I love it. I DJ at private events, and sometimes need to fly to my gigs. My biggest fear is that when I get to an event, it could happen that I will not be able to connect my MBP to XDJ-XZ or CDJs because of driver issues, and there will not be enough time to troubleshoot. As a back-up plan, I would like to take my Serato SL3 box with me, which I can easily use with Serato in Internal Mode, where I will use laptop keys as shortcuts, instead of CDJs or XDJ. But I like Rekordbox more than Serato. So I tried to use RB with SL3, and everything seems to be working, but the Sampler. Is there anyway to rout the sampler to Output 5 and 6?