While I so-much agree with the sentiment of "Don't let a tax issue steer your portfolio...", in this case, I agree *more* (but not totally) with you: it's a 100% guaranteed gain. It's a risk-free return *way* above the market, for that chunk of capital.
At the same time, though: your gain right now is very-much NOT guaranteed: if that stock plummets, your profits are lost *first*. Dayyyyy-ummmmm. SO!
What can you do to *protect* your holding til that 100% window gets crossed? Throw a collar around the thing: buy put insurance, financing it with a sold call. Finesse the numbers (strikes vis delta vis IV) til they work for you. Seek a credit -- may not be big, but it's a bonus.
You won't get equity-market returns by holding this way, but you already GOT those returns, and you're just holding on to gain the TAX system's gift as your return. So, file this away as a bond trade (yknowwwww, a "safety" trade).
You are right. Buying a put, and meanwhile, sell a covered call could help me get back the insurance fee. But I need to be really careful to write those things, though