B"H
You're question is about what counts as a meal after kiddush. All of the pesach related stuff seems extra.
if the one making kiddush drinks a reviyit of wine, does that quit the
obligation of those hearing kiddush or must they drink too?
Is there any way that eating other foods could solve the problem?
Source:
In order to have Kiddish in the place where one eats and that the
Kiddish is considered a proper Kiddish, one must eat at least a
kezayit of mezonot, bread, or a reviyit of wine.
Each person must eat a seuda in the place they heard kiddish: (Ibid):
If someone is reciting kiddush in one room and someone else is hearing
the kiddush in another room if the person listening to the kiddush is
going to eat his meal in the room where he is that is considered
kiddush in the place of the meal. The reason is that the one
fulfilling his obligation of kiddush needs to be in the room where he
is going to eat his meal and not where the person making kiddush
is.[89]
There's no indication in any commentators that I'm aware of that the listeners fulfill their obligation for the seuda by just the person making kiddush drinking another cup. It would be no different than the one making kiddush eating mezonos afterwards, in which case everyone listening must also eat mezonos/seuda for them to be yotzi kiddish.
In terms of other foods, there is at least one commentator that says one can use other foods that one makes the mein shalosh brocho on, although I'm not sure if it's kept in practice:
Source
The Bach agrees to this, saying that as long as what is eaten requires
one to make a bracha acharona (afterblessing) of "me-eyn shalosh"
(made on non-bread grain products, as well as on fruits from the seven
species of Israel and wine) a meal is considered to have occurred. The
Beit Yoseif agrees as well, adding in that the wine drunk must be a
different cup from that on which kiddush was made so that it is
noticeable that it is being used as a "meal." Rav Akiva Eiger notes
that wine may only be used according to the view that the expanded
bracha acharona of "me-eyn shalosh" is made on all of the seven
species of Israel, which includes grapes and thus wine. However,
according to the view that this blessing is only made on grain
products, the food eaten in this situation must be something made out
of one of the five grains (barley, rye, oats, wheat, spelt). The Magen
Avraham (O.C. 283:11) also allows any product of the five grains. The
Sha'arei Teshuva quotes the Shut Ginat Veradim, who frowns upon the
practice of making kiddush in the synagogue and then eating cake to
fulfill the requirement of a meal. However, he then cites the Birchei
Yoseif that such is the custom and there is nothing wrong with it.
Finally, the Mishna Berura (O.C. 283:25) claims that Rav Akiva Eiger's
personal view is that wine should not be used