Not a great idea, and also not good to use TouchID in general. If you're really keen on having a high level of security, the fact that someone can easily force your finger to unlock your Mac is not great. You don't even need to be conscious to allow ill-intentioned people to take advantage of it.

I wish Mac OS would allow the use of a "stress" fingerprint, e.g. right index fingerprint is to use when you're under duress, while instead another fingerprint is for normal use.