How to force bridge to just print like a solid fill layer

I have a 30mm x 30mm x 5mm thick cube. I have a letters “RS” embossed in the bottom surface two layers tall (printing 0.2mm layers). I want the code to ignore that a bridge is coming and just print across the top of the embossed letters as if it was just solid infill.

See the attached image as that will explain.

The reason I’m attempting this is that it will be faster than the filament changing multiple times to do the letters intial layer. Imagine if there were 20 letters. There might be 30 filament changes on one layer. It would be faster if I could just print the inner cube as solid infill. If the gap is small, a normal infill will work fine and I don’t need bridging. If I could just disable bridging that might work but I don’t see a setting. I’ve used ‘Developer’ mode and unchecked ‘Detect overhang walls’ as one post suggested but that does not help.