Haftoro for Choson

I am looking for an explanation of why nowadays a Chosson does not do the Haftorah for a Chosson (שוש אשיש) on his Aufruf Shabbos.

This haftorah is reserved for a special shabbos called Brautloft. It has never been said by a chasan on any other shabbos.

Here is the introductory paragraph from the Minhagim of Worms regarding the Brautloft Shabbos (translated by myself. This comes from a larger work which is not ready to be 'published').

"Nissuin on Shabbos - Brautloft

When a Chupah takes place on Friday, Shabbos is called Brautloft (Bruitloft, Breiluft). [This was not a common occurrence, as discussed earlier, but was done at various times]. (FN 21 - The word Brautloft is translated as wedding, although the actual Chupah ceremony was on Friday, not Shabbos. This Shabbos is also known as שושבינות (Shushbinus). It is important to stress that all references in the Rishonim to Shabbos Sheva Brachos do not refer to the Shabbos known as Schenk Wein, which refers to all Shabbos Sheva Brachos where the wedding occurs on any weekday except Friday. The Brautloft that the earlier sources refer to is when the Chupah takes place on Friday and the actual meal and rejoicing take place on Shabbos. All Yotzros for weddings that are printed in older prayer books, the special Haftorah of Sos Asis that is discussed in the sources, are specifically for this specific Shabbos known as Brautloft. Many people have erroneously confused these two Shabbosos)."

What is the earliest source that restricts the haftarah to a shabbos in which the chasunah meal was held. Similarly, what is the earliest source that resricts the piyyutim to a shabbos in which the chasunah meal was held?

Thanks,
Melech