Just make sure no one else will monkey around with them or they'd be in for a surprise if they tried to plug a phone charger into the ballast output receptacle.
I regularly use a remote ballast box that I made for 70W MH. I also use a remote ignitor. To prevent plugging in inappropriate things, I used a Hydrofarm extension cord, cut in two pieces. The plug has 3 round pins instead of two blades and one pin. These connectors are usually made for HID grow lights in the horticulture industry.
The remote ballast that I use outdoors has no lamp side plug. I wire it directly, and some day I will get crimp on plugs for the individual wires. I rarely disconnect it, though. On that one, I solved the ignitor problem by using a mercury lamp.
I also like to have a remote ignitor as then I can choose whatever length of cable between the ballast and the lamp. Makes for a lighter, smaller fixture, too (currently set up as a table lamp with the ballast on the floor).