I’m having some troubles interpreting the wording of these two and the ways in which I can combine them. The basic idea would be:
Load and equip a hand crossbow before combat, along with a rapier in the other hand.
Attack with the rapier, follow up with crossbow as bonus action, without disadvantage in melee range, both due to crossbow expert feat and then move away from the enemy, avoiding opportunity attacks due to the mobile feat.
Sheathe rapier, throw a throwing knife, dart etc., and follow up with crossbow as bonus action, as the crossbow expert feat lets me ignore the loading quality of the crossbow as long as I have a hand free, which I would after throwing the dart/knife.
Fire crossbow as bonus action, still ignoring the loading as I still have a free hand, and then drawing my rapier and attacking, as drawing attacking counts as same action, and then move away, ignoring opportunity attack from mobile feat.
I have looked all parts of this over, and can't see any reason for this not to work, but am I missing something? As far as I can tell Dual Wielding shouldn’t be necessary, because crossbow experts states that:
When you use the attack action and use a one handed weapon, you can use a bonus action to attack with a loaded hand crossbow you carry.