You'd be better installing something that's not tat or likely to cause you revisits and generates recurring revenue.
Customers have no idea what they want.
As I sad above, you have absolutely nothing to lose by defaulting your current panel, if it works yay, if not then boo.
Oh, and Texecom won't give a shite about your experience with an approved installer, I expect the approved list reads like a who's who of DIY alarms.
Anything used in line with the job, i.e. laptop, phone etc are a bit naff mentioned in the advert imo, it's as though they should be thankful you don't make them get the bus.