Hi Mark,
the brass locators and the bridge (or strap) they sit on are all soft-soldered in place.
This solder will melt at 180-190c and allow you to take either the brass locator off or the locator and the strap out. Best done with a traditional copper solder iron heated over a high-heat flame, you may be able to do it with an electric soldering iron but generally, the tip is too small and often not hot enough. You can use a blow torch but care needs to be taken. Try to concentrate the point of the flame on the brass locator.
This will get hot quickly, melting the solder under and around it. Using a pair of pliers lift the locator and put it on something heat-resistant (it will hold its heat for a while!). If you wish to remove the bridges then do the same. Please ensure you don’t get the letter too hot and in particular avoid the flame near the solder holding the return to the face. Too much heat may also burn the return but should polish back out with some Aerosol polish or similar (assuming it is polished or brushed as it looks). Putting the bridges back where you want will be a bit more problematic as you will need a good soldering iron, tinman’s solder and stainless steel flux.
The letters don’t look very big so as an alternative you could bond long Bighead studs to the inside face.
Hope that helps.