You make it sound like the grease you chose is ill suited to low temperatures. Have you tried anything like squirting some into a little cup and see how it is when you leave it out overnight? Does it turn from buttercream into icing into candy? Relying on the warmth of your hands to bring it up to lower viscosity seems unreliable.

May ride tomorrow, may not. Weather is chancy. Rain was forecast tomorrow, now it isn't. We are in the clear off the south edge of a NE bound atmospheric river storm that is hammering Redding up to Washington. Here's a view from the GOES satellite
https://www.star.nesdis.noaa.gov/goe...OLOR&length=12
(though the storm will go away one day soon, this link to this amazing satellite should work for quite a while)