Lightweight cheap backup amp/head solution

Currently I play in two bands with a Boss Katana Head through a dual speaker Harley Benton cab which sounds good to me. The guitar sound I aim for is clean to overdriven (sixties/seventies rock), but not high gain. For effects, I mainly only use the internal ones (a boost, wah pedal and a tiny bit of reverb). The only pedal in the FX loop is a M-VAVE Universe for atmospheric Pink Floyd stuff.

I started wondering what the best backup solution would be if the Katana suddenly fails on me. Preferably as light as possible.

- a simple moddeling pedal (thinking about M-Vave Blackbox) + Harley Benton GPA amp

- a simple pre-amp pedal (such as TC electronic Combo Deluxe preamp) + Harley Benton GPA amp

- guitar power amp pedal with some build-in reverb such as the Hotone Mojo Attack Pedal amp (although this one seems more aimes towards high gain stuff?)

What are you using as an emergency backup or should I consider other options?