I hope you include not only the hardware repair but also software repair as you really need both to run your Smartphone. Then if you choose Nexus 4 for this reason, you are so great.
You would be challenged if the students would feel that it is worth replacing screen and battery with Nexus 4 (2013) then don’t make an excuse this is a pure education propose only ? Then they cannot change the relationship with their smartphone profoundly.
Then you have to prove that Nexus 4 is really worth taking care of at 2019. Thanks to the open source community, you are able to use the latest Android 9 Pie with Nexus 4.
· Google Nexus 4 (mako)
(Still supported for Android Pie release!) commented by XDA
Probably Nexus 4 with the Latest Opensource clean Android OS would be more comfortable than your 3 years old Android Bloatware Smartphone.
In order to change the relationship with your Smartphone, you need a a great emotional durable technology such as “Custom Rom”, (I borrowed Professor Jonathan Chapman’s concept of “emotional Durable Design) Literally 2013 Nexus 4 is reborn with the latest optimised bloadware free Andoid OS at 2019.
You really need to have your own funky cool user experience to change the attitude against your gadget. Some of smart students would check about the Custom Rom. Don’t limit their potentiality, educate yourself, experience yourself and share your experience. I am pretty share the students will be falling love with the Nexus 4.with deep emotional attachments lol.