Al, I used 19mm collagen's, I still want to try the 16's but haven't got around to ordering them yet.
These are fully cured so I don't see a problem with not being refrigerated for a couple hours.
The cold smoke should work good too, I do mine at 100° for about an hour to dry the casings out then slowly ramp up the temp to170°. I guess you could hang at room temp with a fan on them to dry them out before the cold smoke.
You could also finish them off in the oven if ya didn't want to fire up the Lang
Also if anyone's interested, I checked the weight before the smoke and after they bloomed and there was a 25% weight loss. I was going to check the weight again after a couple days in the frig but mistakenly ate some out of the weighed bad. so that end's that experiment.