That's an interesting question.
Do you think your husband CAN do SMEP? Because not all guys can keep up with that.
Do you think this is a problem of EWCM (in which case do the Conceive Plus) or is it sperm count (in which case do SMEP) but if your hubby can't do SMEP then do the Conceive plus, of course!
I did know that they're quite reticent in the UK to give prog support (and I think they're correct doing that since it's not medically indicated to be anything more than a placebo.) I know some have got them in Spain though if you wanted to give that a go.