Yes, it is safe to hook the sub up to a front input. That's what I would do if I were you.
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I have two GTP-880's in my house and am an Adcom dealer, so I am a little familiar with them.
If you are running the fronts as large, then you are not crossing them over and as such, you will not send the bass to the sub.
Set your mains to "small" and set the crossover point wherever you want on the GTP-880. That should send bass below that point into your sub. The GTP-880 will not send your bass to the mains AND the LFE. You can set the crossover point lower than 80Hz if you want, so try a few settings and see which one you like best.
Thanks for the suggestions. Turns out it was a combo of setting things large & not having calibrated the fronts relative to the sub. After changing over to the fronts as small & a 40 Hz crossover, plus calibrating with a sound meter, I'm now getting good performance out of the sub.
Thanks for the tips.