Is dual boot possible without BIOS/boot manager access?

Hi everyone, (I only used AI to better structure the post, sorry if that offends anyone)

I’m in a bit of a tricky situation with my Acer Nitro V15 (ANV15-51) and I need some expert advice before I accidentally lock myself out of my machine.

The Situation: I want to dual-boot CachyOS alongside my existing Windows 11 installation. However, there’s a major roadblock: My BIOS is password protected (Supervisor Password) and I don’t have the password.

I've tried all the common defaults, but it seems it's a modern InsydeH2O firmware that generates a challenge-response file on a USB drive instead of an unlock code. Contacting Acer is my last resort (from what I've read online, the local dealers in my country are asking us to send the laptops directly to them for a fee, they do not unlock the BIOS remotely based on the code given by the BIOS).

The Current State:

• Secure Boot: Luckily, it is currently OFF (verified within Windows) (managed to do that last year when I installed the Windows, I am not sure how the BIOS worked then and now it asks for a password).
• F12 Boot Menu: Disabled in BIOS (so I can't use the hotkey to select a boot device).
• Access Method: I can currently boot from a USB stick by using the "Shift + Restart" -> Use a Device method from within Windows.

My Questions:

1. Is it safe to proceed with the CachyOS installation? Since Secure Boot is off, I can boot the installer, but I’m worried about the boot order.
2. Managing Boot Order without BIOS access: If the laptop keeps booting straight into Windows after the install, can I use bcdedit in Windows or efibootmgr in Linux to force GRUB/systemd-boot to be the primary bootloader? Any other ways?
3. If I ever decide to remove CachyOS, will I be able to restore the Windows Boot Manager as the default just by using software tools (like EasyUEFI or bcdedit), given that I can't touch the BIOS settings?
4. Does the Nitro V15 have any quirks where it might "reset" the boot order to Windows-only if it detects a change it doesn't like?

I really want to switch to CachyOS for the performance gains and also for testing Linux (I keep reading about Linux online), but the locked BIOS is making me paranoid. Has anyone here managed a successful dual-boot on a "locked" machine?