One thing you should note however, is that while minor conjuration can create objects, it can't create a healers kit (as this isn't a single object, but a small collection of related objects). As such, while you could minor conjure a single bandage, or a single needle, you couldn't conjure the bandages, suture thread, and needle as a single use of minor conjuration.
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One final point - Fast Hands won't help you with healing potions, or magic item useage. While it isn't stated clearly in the PHB - the DMG clearly states that using a magic item is the "Use Magic Item" action, not the "Use Object" action. As such, Thief Rogues cannot use healing potions as a bonus action (even they require an action). Likewise, if a magic item allows you to cast a spell, you are performing the "cast a spell" action - so again, you couldn't cast a fireball from a wand/staff as a bonus action either.
I'd argue that I could conjure a kit. Everything is made up of parts. If you can conjure a hat made of cotton with a leather trim and a feather poking out the side, you're combining several objects. A bag of ball bearings or a bucket of grease or a sandwich or even a pair of dice are technically multiple objects too.
Also, I can't feed a healing potion to someone as a bonus action? That seems so silly... How is that any different than giving them a swig from my waterskin?