Be careful with this, the VSWR you set will likely be wildly different at the harmonics than at the fundamental, and it will cause a different response than a resistive mismatch would, which is the same VSWR at (almost) all frequencies.?
This can be easily checked/verified with a nanoVNA, just set the markers to the fundamental, and to the harmonics which will likely look terrible.? Recall that one of the touted advantages of tuner is harmonic reduction.
The tuner method might for example excite an oscillation which might not occur with a resistive mismatch.
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Another method is to use a short or open after an attenuator, a 3dB pad will yield 3:1VSWR for example.?
You can reverse the phase by swapping open and short, or vary the phase by varying a tank circuit through resonance as a load.? You can get almost 180° phase change in this way.?
We used this at transistor manufacturers for load-pull testing and could get 20:1 VSWR with a low-loss tank at 2 meters.
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I have set up tests at 4:1 using terminations and tees, I could have gone further but I ran out of tees.....
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73, Don N2VGU
Donald S Brant Jr