Full strength Toyota LL red has been superseded by Toyota Super Long Life premix pink. For Toyota, despite the typical vague owners manual e-g recommendation an Asian P-(H)OAT would be the spec. Some LL red may be available but it's getting very expensive even compared to the SLL.
If you want to use Toyota SLL pink premix, best bet would be to just do a radiator d&f and shorten the next radiator d&f interval. It's compatible with the Toyota red, if that's what's in there now. The red is only a 2year/25-30k interval AF, the SLL a 5year/100k AF. But as it's a premix, combined with the LL red that would shorten the interval.
You 'could' do some distilled water d&f's till it runs about clear then use a full strength universal OAT or a low silicate green and distilled water.
Fwiw, I'm currently using Peak Global Lifetime in a 5VZ-FE engine, it came as full strength from Napa and topped off with distilled water to ~50% concentration.