The problem with this is that a Lance being used like what you suggest would end up becoming Chrom's Levin Sword, and Sakurai probly wouldn't want to give the same major mechanic to Chrom. Chrom is kinda limited by the Falchion being his signature weapon AND being unbreakable, so any weapons he might bring can't overshadow the Falchion or else it would go against chrom's identity.
But seeing what he did to Rosalina, maybe sakurai s fine with forgetting this stuff for the sake of uniqueness. Assuming he sin't planning on Bandanna Dee or Pig Ganon, of course.
Unique smash-exclusive stuff for Chrom is fine; but that'd be a little of a bad idea for our movement, right? "hey sakurai, you can make Chrom do ANYTHING" wouldn't really help him realize Chrom's potential... but is still an idea to consider.
your specific example of the Exalted Falchion could work as a temporary offensive buff. Like, chrom could undergo a mini-awakening right there and end up with the Ex. Falchion that yields more damage/knockback for a while. Oh, and this could let Chrom heal himself as a taunt, right?
Divine intervention of Naga? seems like a final smash material to me. the above buff could also work as his final smash. Potentially Naga could even promote him to Great Lord for Badass points. That could also work without naga for his Fs...
so, anyway, i think that by using the ranged javelins and hand axes, Chrom could represent the other weapon classes without detracting from what he is known for. though unless they repeat Samus's gimmick of a Smash side-b, Chrom would have one of the two weapon trees only as custom moves.
My idea of Sword sidegrades could also be used to represent the Axes to, since they wouldn't need new animations. If Sakurai was willing to make the Rapier that i suggested have it's own stab motions, Lances could also be represented via that move; but then Chrom won't have as many swords. i think that's not a bad thing, though.
hum, actually maybe not. Chrom would need a different grip on the Lance. If Sakurai is alright with implementing that idea -> giving Chrom different custom moves like
![Palutena :4palutena: :4palutena:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
and
![Mii Male :4mii: :4mii:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
, then i guess it could work. or, say, if they give Chrom the Luna/Vengeance weapons that also come with skills.
i guess, it just depends on how far he'd be willing to go to make Chrom represent this stuff.
But just as something else for you to consider: Chrom doesn't need to have attributes between
![Ike :4myfriends: :4myfriends:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
and
![Marth :4marth: :4marth:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
. He could very well work as a mix of
![Ike :4myfriends: :4myfriends:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
and
![RoyPM :roypm: :roypm:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
, for example.