I'm very interested in installing Ubuntu Touch on a device I no longer use as my primary one, but this device can't run TWRP; so I can't really install UT on it.

However, the default recovery on the device (a Samsung A7) has an option called "Boot from SD card", so I was wondering, can I install UT on a SD card and boot it using the recovery? And if I can, how can I do that?

I appreciate any answers in advance.