I once read of a really cool idea to use a single-ended tuner on on
balanced line:
Ground the rig.
Don't ground the tuner.
Install a bead balun between the rig and the tuner. These are the ones
made by stringing multiple toroids over a piece of coax.
The idea being that, coming off a balanced feed, half of your returned RF
would love to visit you via the ground. Because of the choke bead balun,
it can't so, goes up the spout for another shot at the antenna.
I haven't tried it, but it sounds doable. The case of your tuner would be
hot with RF, but most oof us live with that now, due to suboptimal grounds
anyway.
Worth a try!
72
John
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