Singleton” factories, ok or bad?

It really depends on what you're doing and the scope of your application. If it's just a fairly small app and it's never going to grow beyond this, then your current approach may well be fine. There is no universal "best" practice for these things.

While I wouldn't recommend using singletons for anything other than stateless leaf methods and/or one-way calls (e.g. Logging), dismissing it out of hand 'just because' it's a singleton isn't necessarily the right thing to do.

Having a few singletons is pretty typical and not usually problematic--a lot of singletons leads to some irritating code.

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