Aside from italics, is it okay (especially in British English) to denote the plurals of 'letters as letters', 'numbers and numbers' and 'words as words' as I've done below? Also, I'm aware of doing it like this—a's, 8's, etc.
Are these okay with single markers on each side?
- Harold's 'a's look like '8's.
- too many 'whereas's and 'maybe's
Thank you.