The arm safe plug should work but I must warn everyone. I done the same thing about three years ago to a Saturn conversion with just a pair of deans plugs but no mounting base. Its not necessary if U glue in the female end.
Anyway I flown it a few times but without the spinner cone because it was causing vibrations. When I let the owner fly it. They left the cone on and the plug came off and and the motor stopped and caused the airplane to crash. In conclusion,the Deans plugs will work, but make sure everything is balanced before putting the model in the air.
For the larger models I use the Maxx Plugs, the smaller ones I like using 3.5 mm connectors. U can also make those Maxx plugs by getting the Anderson poles, Deans plugs and wire and make them as short or as long as U dare.