I was just looking at FBschedules.com and found some interesting Out of Conference Matchups between Southland schools and other FCS foes coming up in 2019

HBU @ South Dakota
Sam Houston @ North Dakota
SFA @ Southern Utah
UCA @ Austin Peay
NW State @ UT Martin
Texas Southern @ UIW
Nicholls @ Prairie View
SLU @ Bethune Cookman
Southern @ McNeese and
Alcorn@ McNeese
Mississippi Valley @ Lamar
ACU is still looking for a FCS opponent.

There are also a lot of SLC match ups against FBS programs

ACU @ North Texas and Miss State:
Nicholls @ Kansas State and Texas State
Lamar @ TAMU
NW State @ LSU
SFA @ Baylor
McNeese @ Oklahoma State
SLU @ Ole Miss
HBU @ UTEP
UCA @ Western KY and Hawaii
UIW @ New Mexico State and UTSA
Sam Houston @ New Mexico