We haven't seen Kingsford actual plan yet, just the broad idea from the Alignment mole.
My guess is that, while it is a viable strategy, it has more than two edges to it.
Since the Alighment wants to break up the league and one of the ways to do that is eliminate the SLN as a force for stability. Even if it is only that force by virtue of size, the total number of ships is signifcant and for a while can keep some of the fires from breaking out between SL member systems and all those places out in the Verge. Kingsford is going to have to draw the commerce raiders from somewhere and, as someone else has noted, those ships have actualy been doing other jobs if only as the enforcement muscle for OFS and their partner/client systems.
Now that you have pulled ships out of routines (even if it cocktails at 1700 hours daily around Planet Tahiti) you are going to have to pick some sort of sets of targets for them, get them together, hopefully train a bit together, and then head off to raid. Where? Silesia doesn't seem like a good bet since they would have to go a really long way in hyperspace to get there and "might" just have a speed problem because what they have to take along for their logistic train. Then, when they get there, they are a really really long way from anyplace they can repair any damage they might receive. So, Kingsford might or might not get any information back for months and months- if he gets any at all including Manticore (or the Aldermani) notifying SLN that x of you ships showed up, the survivors- dam few- are being held and we have released the prisoner and casualtie lists to the Solarian News (and others) Services before this note was delivered to you. The Aldermani will take a really dim view of SLN warships comming into their territory, particularly if they attack anything.
Any RMN warships the raiders run into can be expected to do what damage is possible and then get out of Dodge to spread the word. If they run into a group of Sarnow's modern ships, there will be, at least, an ass whooping.
Talbot Quadrant? Manticore know Mike and 10th Fleet went somewhere [

] and will be moving ships in to restore coverage since this is THE PLACE where SLN can get at Manticorian systems and probably MMM trading with both systems in and not in the Empire. Even if FF ships hit a planet "only" covered by modern RMN LACs, they are not going to enjoy the beating. They may destroy the LACs (or they will be scuttled after the crews shoot themselves dry) but the SLN is probably going to pay a high price for the victory.
Other places? Sure, take several SLN raiding forces into the Haven sphere of planets and RHN is going to administer almost the same level of beating. Go after planets like Zunker and Idaho? Humm, Independent worlds with no SDF to speak of (like Zunkers half dozen ancient LACs) and SLN will have a marvalous "victory" killing SL or independent merchents untill getting their ships destoyed by a couple of the wormhole guard forces who can get to the system before the SLN ships get away.
Anyplace that MMM or Haven MM are going to be operating are going to have some level of defense and/or some level of convoy protection. Even RMN sending older, non DDM/MDM ships on convoys is going to take a toll on the raiders.
The Alignment wants to cut down both Haven and Manticore as a superior force. The raiding into GA space is going to do some of that, but it will have a greater attrition rate on the SLN.
Attacking Independent Systems or forcing SL systems to provide basing or calling on them to provide ships (like, say, Mannheim?, is going to create more poiltical trouble which is exactly what the Alignment wants. The RF can play that nicely, each system becoming a place for sanity with the SL going crazy.
Since some have suggested that the SLN is going to have to set up either semi-perminent bases for the commerce raiders or create mobile logistic forces, that would be a wonderfull use for a number of those older and less capable RMN light units- sneak around and scout then run like hell and report. Besides, Haven and Manticore can drop into a system being used as a raider base, shoot up the base and leave the planet and local shipping/industry totally alone- and do it from beyond any range the SLN ships can match.