B"H
The Ramah in Shulchan Aruch (referenced below) says one cannot go back to repeat the blessings of Avos that one didn't have kavana for. There's no distinction of the individual person is confident that he will have kavana a second time
(Even without a special siddur if one realized one didn't have kavana and now wants to go back, it stands to reason that he would try to have kavana the second time, but we still do not allow him to do so)
There are other ways to "make up" for the lost kavana without repeating the brochos, as this article details:
If in the middle of Shmoneh Esrei one realizes that he did not have
kavana during Avos, is there any way that he can still fulfill his
obligation of having kavana in tefilla?
The Beiur Halacha (OC 101 s.v.
veha’idna) suggests that in this case one should silently wait and
listen to the Shliach Tzibur’s repetition of Shmoneh Esrei until the
place he reached in Shmoneh Esrei and then recite the rest on his own.
Although the Shliach Tzibur in our time cannot recite Shmoneh Esrei
for someone who is able to daven on his own, in this situation the
Shliach Tzibur can be motzi him with the tefilla. The reason for this
is as follows: The Rama (OC 101:1), in the name of the Tur, rules that
we do not allow a person who has not concentrated in Avos to repeat
this bracha. Thus, this person now has the status of someone who
cannot daven on his own, and therefore the Shliach Tzibur can be motzi
him. According to Rav Shlomo Zalman Auerbach, zt”l this psak of the
Beiur Halacha has not been accepted as normative halacha (Halichos
Shlomo, p. 100 in Dvar Halacha 12).
Rav Shlomo Zalman Auerbach, zt”l (Halichos Shlomo 8:9, pp. 99-100)
quotes another solution in the name of the Chazon Ish. One should
return to the place in Shmoneh Esrei where his mind wandered and now
with concentration recite in his mind only until the place he is up to
in Shmoneh Esrei. According to the Chazon Ish, “his kavana will now
join with his previous words,” and this is not considered to be
davening without words (ibid., p. 100 Dvar Halacha 12).
Rav Shlomo Zalman continues and states that he “should also try very
hard to concentrate well in Modim because it is proper to do whatever
he can to correct the situation.” The Dvar Halacha (ibid. 13) explains
that although the opinion of the Rokeach that if one concentrated only
in Modim one is yotzei, is not quoted in Shulchan Aruch as normative
halacha, in this situation we should follow his practice. Since we do
not have the option of repeating Shmoneh Esrei when kavana was lacking
in Avos, we should at least fulfill tefilla b’dieved according to the
Rokeach. This together with the Chazon Ish’s solution mentioned above
is the best way to salvage our tefilla.