Bluetooth keyboard or at least touchscreen for grub

I have a dual-boot system with grub as selection application. This setup does not work to select the OS of choice, because the Bluetooth keyboard is not (yet) paired, and therefore I cannot use the cursor keys. 1. Is it eventually possible to do this with grub? The device has a touch screen. Alas,

[bug #56088] Side effects of setting variables are not undone after exiting a context in which they were set

URL: Summary: Side effects of setting variables are not undone after exiting a context in which they were set Project: GNU GRUB Submitted by: felix_s Submitted on: Sat 06 Apr 2019 06:28:05 PM UTC