I've actually written programs like that and honestly names like 'sigma' and 'beta' and 'v_t' worked just fine. Many of us have used (x1, y1) and (x2, y2) without confusing anyone because the digits weren't subscripted.
The ability to use Unicode in identifiers I'm sure is appreciated by non-English writers but that's a decidedly different issue. This is a solution without an actual problem.
(from my phone)