I would say not really, Abyss weaponry is mostly used by extremely radical Inquisitors, so I would find it quite surprising in the hands of a low Acolyte. And don’t really require a Psyker to use afaik
On the other hand, I would wager an easier way to have weapon + warp, by building upon Psybolts, which are Bolt rounds used by Inquisitors and Grey Knights, which are warded and can be empowered by Psykers to make them quite effective against Daemons.
Not saying that I want to see Psybolts, but I would love to see them use it to create Warp Bows, which would let the Psyker either shoot arrow normally, or hold to charge it up to have different power imbued to it (Soulblaze, Piercing…) or have it explode into different manner.
Which could equally work on a Crossbow