Labour shortages and Construction Robots, page-20

You would still be legal share holders of FBR, you just couldn't as easily sell those shares.
A similar thing happened over in SFG (aka Seafarms) when they demerged CO2.
https://hotcopper.com.au/threads/ann-sfg-co2-demerger-update.4308939/
And the next link in this same SFG / CO2 example shows that years later you can still "benefit" from having unlisted shares.
https://hotcopper.com.au/documentembed?id=uOMxKKzFkiWRTLKhOROKAxjvTDYD5Q60yBKZs%2FF%2Bke92GA%3D%3D
"benefit" of course is in the eyes of the beholder.

Share consolidation and CR, or delisting to relist on a overseas stock exchange....both are possible futures for FBR.
If delisted from the ASX and relisted overseas, would existing shares be open to trade on the new listing? I doubt it. More likely I reckon is that a new legal entity such as "FBR Global" (just an example) would be created and listed instead, which would be part owned by FBR and part owned by a venture capitalist with deep pockets.
Of course this would mean that the current FBR shareholders would be excluded from selling their shares (and taking profit) in the new listing.