The problem of expandability of "light" moible devices with only one Type-C port has a standard solution called "docking station". Docking stations usually have a USB hub to expand USB functionality, usually already have a USB-to-LAN device, and can switch roles of USB-C ports, both power role and data role, and also can engage the Display Port direct mode.
To do so, docking stations do have substantial intelligence to negotiate Type-C and Power Delivery contract in right direction (depending on who is powered from AC-DC and power other capabilities), and select correct data role for the portable device.
Initially it is likely that the tablet will come up as USB host and a source of power. After exchanging Power Delivery discovery and capability messages, the power role will be reversed (I assume the dock receives power from some AC-DC adapter, which also could be of Type-C). However, reversing power role of the tablet to "sink" will automatically reverse the data role from "host" to "device". Then it is likely that the dock, knowing that is cannot be "USB host", will offer "data role swap" to the tablet (again over PD messaging channel), and the tablet will accept it and switch into USB host role while continuing to be "power sink". As you might see, no "splitter" or USB2412 simple 2-port hub have the intelligence to do all this negotiations. That's why the docks are a little but pricey. You did save on a cheap tablet, but now you have to pay to expand it.