I have had belts rewebbed in the past and it is a lot cheaper, but it depends on the make, Pacific Scientific can be rewebbed by them in the UK see
Pacific Scientific
Amsafe not sure about but try
Amsafe Aviation (UK) - U.K.
You don't tell me the aircraft model or make BTW so I am a bit limited in what I can help you with..
Part M to be honest just sucks....... It is so full of holes you could drive a legal horse and cart through them........ define manufacturer... Cessna I believe gives the Aerobat belts a 5 year life, but the makers of the belts if I am right do not.
Cessna as the Aircraft manufacturer tell you you must do the valve guide inspections in accordance with Lycomings SB, now if it is a later guide that tells you to extend it to 1000 Hrs, but the EASA AD tells you to ignore it.....
But on the other hand EASA part M tells you you must go with the Aircraft manufacturers recommendation...... Bit of a chicken and egg situation......
Cessna on a 152 give a life of 5 years on the brake hoses.. but if you do a really critical search you will find a newsletter issued in 1985 telling you if it has the teflon hoses installed they are on condition and they will update the manual presently...........................24 years later and I am still awaiting the manual being corrected............ such is Cessna!