Flashing TWRP with the LOS recovery? Or from Android?

[internetaddict24]

Hello,
Being in a hurry and with a half broken ROM I installed LOS 17.1 official build and then Magisk. Everything went smoothly but it replaced TWRP with the LOS recovery.

And I will be away from a PC for a while, so cannot use fastboot.

Can I do it from Android? Like those old TWRP installer apps?
Or can I use Magisk somehow? Maybe even a root terminal with a dd command?

 

[internetaddict24]

I ended up selecting the zip in Magisk's install module prompt, and to my amazement, it worked!
Apparently Magisk can fully emulate a recovery environment even if the zip is not a module.
Amazing really. I have now TWRP installed