Add to end of each line... kinda

Visual-block mode can be used to add something to the end of each line, even if they are of differing lengths. However, what if it's not quite at the end?

Input

function! FixLatexChars() 
	execute '%s/\\/\\textbackslash{}/c'
	execute '%s/#/\\#/c'
	execute '%s/\$/\\$/c'
	execute '%s/%/\\%/c'
	execute '%s/&/\\&/c'
	execute '%s/_/\\_/c'
endfunction

Output

function! FixLatexChars() 
	execute '%s/\\/\\textbackslash{}/ce'
	execute '%s/#/\\#/ce'
	execute '%s/\$/\\$/ce'
	execute '%s/%/\\%/ce'
	execute '%s/&/\\&/ce'
	execute '%s/_/\\_/ce'
endfunction