Depending on how aggressive the RD really is, maybe.
In a 75 you could house a hypostumos punctatus, one of the "common" species would be fine. They don't get overly large. My small RD male left it alone in the quarantine tank.
It would be stressing the tank a bit, but a sailfin would work too. Although two large rather aggressive fish may be a problem. Sailfins can reach 18" so it isn't the best option for a 75 gallon tank.
If you get a smaller RD or trimac then you can choose a pleco that you like. I'd get something that is a bit hardier just in case. Cichlids typically have their mean juvenile period so a lot of the fancier plecos probably won't survive that stage even with cover.
Starting out with them together from the beginning gives you the best odds of having both fish live together. At least that has worked well with current RD and pleco living together now. Cichlids tend to ignore bottom dwelling fish as they get larger, but they tend to dislike new tankmates and can be extremely hard on them.