Allow combing diacritics over symbols

[hornc]

Suggestion:
Strict ΙΧΘΥΣ requires all symbols to be a 'sigma'. Unicode contains a lot of sigmas, but the number is finite.

Allowing combined sigma characters, e.g
ςͣ sigma + combing a-above
or
σͫͨͨͨͯͥͮ sigma + combining roman numerals 'mcccxiv' = 1314, Zalgo style.

These are difficult to view on most output displays, but would allow a literally infinite number of combing character combinations on a base sigma.

combining roman numerals:
i U+0365
v U+036E
x U+036F
l U+1DDD
c U+0368
d U+0369
m U+036B

or combining alphabetic:
a U+0363
b U+1DE8
c U+0368
d U+0369
e U+0364
f U+1DEB