Evidentially not.
These are the type of "toggle" fittings that I am referring to
View attachment 299236
If you try to remove the fitting, the lower part falls in to the cavity. The above costs £38.99. I don't know any local plumbers' merchants that stock them.
Would you be happy if a plumber told you that you would have to wait 3 days for delivery before you can use the loo seat again, and that there would be an additional charge for them to come back.
As per
@Madrab 's post whenever it is possible I fit a new blindhole/topdown fitting. In the example above though the threaded rod is part of the fitting and not a separate machine screw.
If it is a like for like and the plugs are
interset fixings, then yes I would.