What a funny idea! But why not, if the peptides have a very large size. Because it is necessary to think that an antibody makes 150000 Da to which one must add 40x 250 Da of biotin, and finally several streptavidines of 60000 Da per antibody. The final complex may not leave much space for the peptide. Otherwise it would be wiser to reverse coupling streptavidin to the antibody by a Schiff base with the reduced sugar residues of the antibody. And reacting the peptide coupled with NHS biotin. A little less biotin, and a little less streptavidin: a little more luck for the peptide to express itself. Otherwise directly coupling the peptide to the antibody, in the same way via a Shiff base.
Humana Press has published a couple of guidebooks with great recipes for peptide conjugation: The Protein Protocols Handbook, and Methods in Molecular Biology (especially Vol 36: Peptide Analysis Protocols).