My choice here would be the 4ms QPLFO, actually...since that gives you LFO periods that can exceed an hour in length. Plus, this can be backplane-patched to a 4ms SISM for CV-controlled mixing/inversion/etc which also makes patching simpler, definitely a plus if this is intended for pedalboard use.
-- Lugia
The QPLFO looks like a good candidate too. The 4ms site says it is only available in DIY kit form. That is a bit beyond me at the moment but I imagine there are some available on the used market. Thanks!