Peter does only have a biscuit rather than a cake everyday, but he can't be managing his ordinary ju jitsu/fencing/gym on top of the 9 - 5 and the Harlequining.

Pym's has a photographic studio; Bunter could join that and be terribly serious and despise the frivolity of the copywriters' corridor while simultaneously managing to chat up the typists. And you should definitely write it (or the Harriet version)