Haven’t had a problem since I started using Linux full time in 2019 but I rarely boot to Windows (usually once every few months to update it). I have W10 and Kinoite (openSUSE before that) installed on separate SSDs. I used 2 EFI partitions (which I make backups of from time to time) on the respective drives the OSs are installed on.

You could use distrobox to run an arch container and access the AUR directly.

https://github.com/89luca89/distrobox

It’s what I use for some applications on Kinoite.