I get what you're saying. And without being there to see/feel the tiles it's tough for me to say... I also have never kept beardies...
I'm just thinking I'd be inclined to go overboard on safety before risking it. Like I always say about questionable prey "when in doubt throw it out" I also say "when in doubt KEEP it out" regarding anything I put in my enclosures.
I'm certainly not telling you what to do, just sharing my thoughts. And again, I could be wrong completely since I am not there to physically see it.