Is "presumably" in this sentence an interruption or just an adverb?

… bringing me to Britain to, presumably, be interrogated and executed.

Or

… bringing me to Britain to presumably be interrogated and executed.

The way I see it, presumably can either be interpreted as an interruption or just an adverb in this sentence. If the former, then it should have commas on both sides, as in the first example. If the latter, then no commas. However, both of these examples seem a bit off to me. Which example is correct? And if both are correct, which is most natural?