The only way of forcing the battery to heat up so it can be charged at faster rates would be to “yo-yo” drive about 5 -10 mins out from the charger…strong acceleration followed by strong regen followed by strong acceleration and so on.
If you leave home in cold weather, even if the battery has been charging at home, it will be cold - It doesn’t get preheated like in some other cars. (Well it does - but only if it’s really cold, and by all accounts not a lot of heat is added). So when you arrive at the first ultra rapid charger, even if you’ve been driving on the motorway, you’re very unlikely to max speed on that first charger if the ambient temperature hasn’t increased a lot as the battery will not have warmed up sufficiently through driving (due to the high efficiency, heat scavenging into the cabin, and also cold air passing under the car & battery).
At the first rapid charge the battery heater may be turned on automatically if required but then switches off automatically and instead the charging itself can continue to warm the battery.
If you arrive at the first charger with a low SoC and charge there for long enough the battery will gain a decent amount of heat. You might hit 70+kW for a few minutes if you’re lucky.
If you then drive at 70 on a motorway for another 175-200 miles or so then most of that heat should be retained and so when you charge for the 2nd time at an ultra rapid you should then get max speed pretty quickly.