Check the rest of the jacket carefully before spending too much time on patching.
I thought I'd just got the one hole in my eVent jacket when I found a pothole in the middle of a puddle last week, but when I cleaned it and held it up to the light, there were lots of small abrasions that had damaged the membrane but weren't really visible from the outside.
Refills are going to be a problem unless someone with reasonable national coverage takes it on - Blacks or similar, and £3 per refill is always going to be a put-off. In the US, the hydroliser sells for $250 and the reactor is $150, as an estimate of what that may cost here.
The worst problem is that the power density doesn't seem to be all that wonderful. This review quotes the cell/reactor capacity at 8500mAh at 5V (42.5 Wh), and the cartridge weight comes up as 96g elsewhere. By comparison, a 18650 li-ion cell has a capacity of about 10-11 Wh,weighs in at about 40g and doesn't require a 150g reactor to use. Home recharging is vastly easier and cheaper too.
Interestingly, the other guys were using an MSR Windpro, with no better success than me (until they also hand-warmed the gas canister).
Remote canister stoves work best if you routinely invert the canister.
Used with the canister upright, remote canister stoves are often worse than canister top stoves as there's no heat conducted back down the burner to the canister. Also, if you use a canister upright, then try inverting, you've often used up most of the propane when upright, and are back to needing to warm the canister to get it going.