The MLP-1 will definitely help you with master link disassembly. It's been much more useful for me than simple needlenose pliers. If your chain has enough slack for the SRAM-style masterlink to disengage (only a few mm) you should be able to remove it easily using this tool or a similar one.
I'm doubtful that it will really help you with assembly, because if tension is high it'll be difficult for you to keep the loose ends of the chain lined up in the teeth of the jaws. An alternate technique you might try is only partially wrapping the chain around the top half of the chainring during reinstallation. Once the chain is joined, pedaling forward slowly should be able to pull it the rest of the way onto the chainring. Use caution to avoid binding.
It's pretty much a given that trying to reinstall a chain while it is under tension is going to present more difficulty than not, so the best option might be to look at methods for optimizing rear wheel removal and cleaning the drivetrain while installed on the bicycle.