Safe options:
1. Tune with 705, then connect QMX
2. Resistive bridge in front of any tuner - switch to straight thru after tuning up. A lot of manual QRP tuners integrate this into the tuner
3. Use tuning mode on the QMX during any tuning. Should be safe to use the T1 with this. Should be safe to use any automatic tuner this way, although many won't tune with the low power. Just be careful that the tuner does not automatically retune during use.?
4. Tune with significantly reduced input voltage, eg. 7 V for a 12 V build QMX.?
Unsafe:
Using full power and no bridge with any tuner.?
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73, Dan? NM3A