Yeah, that should work. As long as you can drop your charge rate that low, you should be fine.
Tell you what I did. I made my own packs. When I did, I soldered 2 connectors to it. One for the rx plug. One Tamiya plug. So when I want to charge, I just plug the Tamiya plug into my charger. I don't have to unplug the rx pack from the switch. That's one way of doing it. I did that on my Maxx because I was sick of taking the battery compartment apart every time I wanted to charge. But making an adapter will work just the same. Just go out and get the connectors and link them. It's probably cheaper than trying to find a premade one. Which I don't even think exist...