Scan the remaining fasces decals, then 'flip' them to reverse the image, and print-out onto white decal paper.
No need to buy a relatively expensive decal sheet, or even decal paper from, for example, Testors. Ink-jet or laser printer decal paper, in white and clear, can be bought by the sheet, from office supply or speciality paper suppliers, and works out, per sheet, about a tenth of the price of buying a 'model brand' pack of exactly the same stuff.
The resolution of the final image is dependent on the quality and type of printer used (i.e. laser or ink-jet), and is therefore not as crisp, sharp, or dense as litho or screen-printed, commercially produced decals, but is generally good enough. This is especially true of simple designs, with strong solid colours, and the fasces are a good example of this.