An eight bell set and a twelve bell set were refurbished for my home tower by a donation as a memorial in thanks for the lives of family members etc. Perhps you might find a family willing to do the same for you, in wjhole or in part of the costs.
Usk tower successfully applied for a grant from a local house-builder - quite often there are some "corporate social responsibility" conditions attached to planning consent for new developments which require the builders to invest in the local community
It's also worth looking into the Landfill Communities Fund