I went on #refind to get some help, and was told to use efibootmgr, which worked perfectly! The exact command I used was: $ efibootmgr --bootnext 0000 && reboot (I found 0000 by running efibootmgr with no arguments to figure out what to pass to --bootnext)
Apologies if this has already been asked and answered. I tried to find an existing thread, but wasn't sure what to search for. Does rEFInd have anything like Grub's booting once-only (https://www.gnu.org/software/grub/manual/legacy/Booting-once_002donly.html) feature? I'd love to be able to reboot into Windows from Linux. Thanks in advance!