This might be a weird idea, but a way to synergize the blast feats with a character multiclassing into this class could be done with martial or spellcaster-specific feats? Like a 2-action focus cantrip that acts as the stanceless eldritch blast, or flourish feats for ranged and melee martials? Then throw in a "Special: this feat counts as a prerequisite" kind of line for stanceless and ranged/melee blasts.
Furthermore, I feel like the stances should a class feature. To gain access to a second stance, this could be handled like how druids and bards get their subclass-blending feats, except this feat is accessed at 4th level at least.
As for other features conduits can probably have that could be accessible via multiclass, I really don't know to be honest.