There's no way your current forks are 2.5kg unless they are hewn from solid lead.
The carbon fork is a definite "yes" - you'll save about 600g over the (I guess 1kg) steel fork
Otherwise, this is a bit of a daft endeavour - you have a basic basic with heavy components - and no amount of shaving down brake blocks or changing skewers is going to make any sort of tangible difference.
Just swap the fork & the wheels (when you can afford to) - ride and enjoy.
The next things to look at are the chainset, cassette and saddle (but for that money you could put towards a better bike on ebay)
There's no way your current forks are 2.5kg unless they are hewn from solid lead.
The carbon fork is a definite "yes" - you'll save about 600g over the (I guess 1kg) steel fork
Otherwise, this is a bit of a daft endeavour - you have a basic basic with heavy components - and no amount of shaving down brake blocks or changing skewers is going to make any sort of tangible difference.
Just swap the fork & the wheels (when you can afford to) - ride and enjoy.