I haven't found the record you are seeking so far but perhaps the following ties in a number of records for elimination:-
The non conformist record for 1824 looks like one of a family born to Thomas Jones and Margaret Evans-Elizabeth(1820),John(1822),Margaret(1824),Mary(1827).
There is a Corwen marriage of 1819 for Thomas Jones and Margaret Evans and I think it probable that Thomas dies in 1829 and it is his will as a shopkeeper in 1829.(the bond has an Edward Evans)
Further this death fits with a burial of Thomas(1792-1829) who therefore could be the son of Elizabeth and John (11th Nov 1792 "Corwen" transcribed under Llandrillo as per your post)
The balance of this family are probably at census refs
1841 1428 4/6 5
1851 2509 269 3
1861 4311 13 19
Perhaps also,John Jones the father of Thomas(1792) is the boot and shoemaker in the 1828-29 Pigot's directory.
All of this feels a bit like a mixture of non-conformist and established church but the fit is welln worth considering.
None of this relates to the Margaret Jones will of 1826 as the Margaret(nee Evans) I believe lives until at least the 1850s
There is a non conformist record for a Margaret 1826 Ruthin on FamilySearch.I have looked at the Blackwell index and can't find it.Perhaps it is available on the non-conformist site:-
www.bmdregisters.co.ukThis is a subscription site and I don't have access.
Regards
Roger