Wanted: Fix my backpack (Chrome Warsaw)

The straps of my backpack and the buckles are starting to disagree with each other -- i.e. the buckles do not seem to firmly grip the straps anymore, and they slide up when I'm riding, which is a royal PITA.

The buckles look like this: http://www.chromebagsstore.com/media/catalog/product/W/a/Warsawv8_Black_Enlarge.jpg

My plan is to (1) unstitch the buckles off, (2) put proper ladder lock buckles on, (3) restitch everything together. Because I do not have a sewing machine I will pay you money to do the above (I can get the buckles if necessary).

I guess that, given the sewing machine, the job would not take hours -- if the cost is more than 50 quid (new buckles excluded) I might as well get a new backpack and figure out whether I can sell the chrome.

If all goes well we might discuss two extra mods I'd like (adding loops for a waist belt and a semi rigid internal frame) but that are not strictly necessary.

PM me if interested.

Not sure if this will help but google/Ebay sewall and you will find a nifty tool which is inexpensive which will enable you to do this kind of repair easily yourself.I used to have one in the forces and used it to alter belts,rucksacks etc,It's a good bit of kit.
Sorry should say sew awl

Thanks, I'll look into that!