Liquid inoculation in the winter

I just burned biochar a week or two ago. Normally I don't burn it this time of year, because it's too cold, wet and dark.  The wood doesn't burn very well, and it creates too much smoke.  However, we just had a long, very dry spell, so I did. It went pretty well.

However, I've had some problems with inoculation.  I normally inoculate with a liquid mix. It's just so much faster.  I don't have chickens or a lot of land to lay it out on.  One problem is that the inoculant gets frozen.  Hard to pour it out when it is iced over.  Another problem is that when I'm done pushing the last of the biochar out back into the container with my hand, I can't rinse it off with frozen water.  Obviously, this is the part of the year in the Northern Hemisphere when it is most likely to freeze.  One adjustment I've considered making is to do my daily drench of the biochar in the afternoon when I come home from work, etc. instead of in the morning. It's just much more likely to have melted in the afternoon.  

I am mostly done with my own yard. I am taking it to my volunteer gig at a nearby school to biochar the orchard I put in.  

Please let me know if you have ideas or if you have figured out how to solve this issue.

Thanks,
John S
PDX OR