ONI I guess you could, but you would be basically getting nothing in return except maybe a few trade deals. All Redford would know is that you hauled back a cruiser they were already going to, and nothing more. Besides, If Redford learned that you got any tech from that cruiser, they'd probably try to take it back.
Also, if you were to take the cruiser, it'd be hard for Redford to find it without literally trying to scour the entire galaxy. Redford would have to try and rule out pirate gangs, enemy factions, neutral factions, etc.
And if you were to enter it into your navy, Redford would have to find a very valid reason to try to pick a fight with you besides "Hey, give that ship back!". Cause think about it, It's Redford's fault for not at least having a patrol craft. So if it got stolen, it's their fault. Besides, the Redford Republic could easily build another to recoup their losses. It's a cruiser that is destined for the scrapyard if it returns anyways.