My HTTimer Alpha supports changing the look to other timers, but keeping the timer logic. It currently supports qqTimer only, but I'm working on Prisma, cstimer, ctimer and TTW.
http://httimer.atspace.cc/Alphatimer/timer.php (this is a limited alpha version, there are lots of bugs, and some features are disabled)
Layout->Edit Code, Load PrismaPuzzleTimer, Apply
I know this does not look a lot like Prisma, but I will improve that as I wrote the code in the past 5 minutes, and the components are arranged similar to Prisma.
http://httimer.atspace.cc/Alphatimer/timer.php (this is a limited alpha version, there are lots of bugs, and some features are disabled)
Layout->Edit Code, Load PrismaPuzzleTimer, Apply
I know this does not look a lot like Prisma, but I will improve that as I wrote the code in the past 5 minutes, and the components are arranged similar to Prisma.