It wont matter how many coats you put on TOP.
I don't think there is a decal made that can be applied and then masked over without the decal coming off when the mask is removed.
Really not worth trying.
Masking techniques can be adjusted, just cutting a thin outline mask of the roundel, in conjunction with a paper mask , will work. You only need the precise edge of the mask to seal for the amount of time you need to paint. sealing that edge immediately with clear will give some time relief but the work needs to be done expeditiously to get the mask off the decal as soon as possible. There are ways to de-stickify the mask as well.
Cutting the roundels out of paper , wetting the paper and getting it to lay down on the model may work as well.
Mask , clear sealer shot , white application , mask , blue application , mask , red application , touch up white edges if need be , clear seal all colors would be my procedure.
It worked a treat on the Biff:

Or save alla that and just use some extra roundel decals. I still have mine from the Biff , or WNW has great decal sheet selections.
Good luck!