Only just seen your message. The only William Jones I can find recorded for Brondeifi fits your information.
William Jones, formerly of the Cambrian Shoe Factory, Lampeter, died at Bridgend, Glam, 15 Feb 1894 (54).
On the same stone there is a dedication to:-
Janie, eldest daughter of William and Anne Jones, died at Bridgend, 2 Dec 1891 (19).
I just checked... we exchanged some info before on the Cambrian Shoe Factory.
Couldn't find his birth cert, but can find his marriage cert.
William Jones was married in St Peters church, Lampeter, 1871, December 13th
To Anne Davies,
Both of full age
He bachelor, and she spinster
Both living in Lampeter at time of marriage
His occupation given as Boot manufacturer
His father John Jones, also Boot manufacturer
And her father David Davies, Inn Keeper.
The grave info came from the volume of Unitarian Grave inscriptions by E.L. and M.A. James, and the marriage info via Findmypast.
Best wishes
Jen (aka rebecca_riots)