Oh absolutely-- like I said, it'd have to be done without mentioning *any* specific details of Homura's situation, because 1) no apotheosis for this Madoka and 2) we promised Homura we wouldn't bring Madoka into more magical girl things.
It would have to be phrased very carefully. It probably wouldn't even be too terrible if Madoka figured out it's about Homura (she is pretty obviously 1) driven and 2) traumatized) but the situation specific details could be left out.
Something like, "hey, my friend has something they literally believe is their life's purpose, that they have been working toward for years, and they haven't succeeded yet. In fact, the way they've been going about it actually may have made it more difficult and dangerous, perhaps even impossible for them to succeed. If they find this out, it will absolutely destroy them. But I can't keep it from them forever, because if I don't tell them, someone else who specifically wants to hurt them might tell them instead at the worst possible moment. What would you do? Would you still tell them, and if you would, how would you go about it?"
Here be Dragons.
At Madoka's current level of Self-Esteem, bringing Madoka into the knowledge or the implication of the knowledge of the potential bomb might almost
guarantee Madoka's Apotheosis. She wants to be
directly useful to everyone involved in the whole Magical Girl thing, and we know from canon that even
with knowledge of the Magical Girl system and all its death traps, she'll make the wish and sacrifice herself for others. If one reads the PMMM novelization (hell, just the first chapter is enough), she thinks
heavily in philosophical terms sometimes... more so then she outwardly presents. Ironically, she's very much like Homura in this regard... actually in a numerous set of ways when one adds in details from the PSP game which shows much more information about the original timeline
• Both Madoka and Homura were transfer students from far away, with I
think if memory serves both coming from Tokyo.
• Both were mercilessly bullied when they arrived in Mitakihara by their peers.
Sayaka became to Madoka, what Madoka became to
Homura, someone who protected them from the others who bullied them.
• Both have... very stalkerish tendencies towards each other. No seriously, during the original cycle,
Madoka was the one following Homura like a hawk and watching over her.
• Both are absolutely willing, even if they know the full secrets of the Magical Girl system, to sacrifice their ordinary life to save the other. In an alternate version of the first loop that's possible to gain in the PSP Game, Homura has a chance to be both Lich and Witchbombed before she even contracts with Kyubey... and even knowing all that while still human... she won't care and wish anyway to save Madoka.
Bringing Madoka into the loop without guaranteeing her self-esteem issues are on the mend is almost
asking for her to become Madokami. We haven't been engaging with her much at all. Compared to Sayaka, Kyoko, Homura, and especially Mami,
she potentially knows us the least. That being said...... I do agree with bringing Junko into the mix.
We need someone who can boost Madoka's self-image issues and the anime makes it clear (indirectly, but both the first chapter of the novelization and the show itself presents this evidence) that she
underestimates the issues her daughter is facing. Either that or her approach to boosting Madoka's esteem hasn't gone to the measure it
needs too to lift her up properly. This is NOT an indictment on Madoka's mother, mind, the PSP game once again presents evidence she can -if social-fu'd enough- mother hen everyone and provide much needed support. We just have to angle everything
just right.