Weird workaround for default placement of elements from Master Palette

It seems that MS doesn't allow for custom x/y positioning of symbols from the Master Palette if added to a custom palette, but I've found a weird work-around. After seeing the following demonstration, the question is, is there another/better way to get the results?

1) Master palette →Symbols → Left & Right Bracket for whole time signatures are added to custom palette. Adding both symbols separately to a notehead won't work for the purposes intended.

2) After applying the left bracket to a notehead, the right bracket can be added not to the head itself but to the left bracket again, which interlocks its position so that when the left-bracket is moved, the right-bracket moves along with it, yet the right-bracket will not move the left one. This is slightly nifty which was found out by accident.

3) Notice that the left bracket, even if it is moved further away from the note head to the left and then added to the custom palette, upon its application it will not retain that custom offset value, it'll be right on the spot of the note again.

4) There's another work around! Notice that the right-bracket does retain its offset relative to its interlocked left bracket. Exploiting this, I added one more left bracket and then interlocked the Left-Right bracket connection to it, and then I can move it around it and then drag the original left bracket to the palette, but before that make it invisible. This sounds complicated so I'll do a quick screen-cast.

Maybe someone will find this useful. If not, does anyone have any other tip related to this? A better way?