since I got a bunch of help from the RIOT community on this, I wanted to briefly let you know I wrote up my experiences of getting QUIC to run on some IoT boards for the NDSS DISS workshop.
Towards Securing the Internet of Things with QUIC. Lars Eggert. To appear: Proc. NDSS Workshop on Decentralized IoT Systems and Security (DISS), San Diego, CA, USA, February 23, 2020. https://eggert.org/papers/2020-ndss-quic-iot.pdf