Using HiFi Speaker-Amp selector to switch between 2 Tube Heads and 212 cabinet? (Supports HiFi Tube Amps)

Hi,

I wanted to know if it would be recommended to purchase a “Fosi LC30” Link

It claims to support Tube Amps (the HiFi kind) and has 390 Ohm No Load condition Resistors.

I would like to switch between my Marshall SC20H and my Blackstar HT1-RH, feeding into my Marshall 212 cabinet… (I plan to replace the HT1 with an Orange Dual Terror 30W soon).

Is this is a good idea?

Would you recommend buying the LC30 and switching out the internal 390 Ohm No Load resistor with a pair of 16 Ohm 50 watt Power Resistors in parallel, so it suits the Guitar Amp impedances better?

Lastly, I am based in south east Asia, it is quite infeasible (logistically and financially) for me to acquire Amp Cabinet Switchers from brands like Radial, KHE Audio, N Audio and others.

I would truly appreciate any advice.