You have extensive practice experience with the crossbow expert feat, with that experience you can gain the following benefits;
- You are ignoring the loading quality of crossbows by which you’re proficient.
- Of course being almost within 5 feet of the hostile creature does not impose any disadvantage upon your ranged attack rolls.
- So, whenever you use the attack action and also attack with the one handed weapon, you can also use the bonus action for being attacking with the hand crossbow that you’re holding.