Yeah, you can't really bend it yourself - at least not cleanly, reliably and without burning your house down. JayzTwoCents did bend some with a blow torch on YouTube....but freehand as I think you're talking something like 820 - 1260°C!

You can get it pre-bent with a single 90° bend. The 16mm OD seems the best option as it has an 11mm ID - the rest are smaller in ID than I'd like. You can cut it with a diamond wheel in a Dremel but you need to be careful about the dust created - you don't want to breathe it in.
@Mcnumpty2323 I think I'll try some of the ZMT 16/10 when it comes back in stock - it's a third the price of Norprene! Now, if I can just find some QDCs that'll fit....and have bulkhead connections....and be in the right colour!