The car will do it on its own as soon as the parameters are met.
If changing your thermostats make it meet the parameters then it will do it without a forced regeneration (if it needs to)
If it was me I'd drive home.. The set off out at 8ish when the roads have gone quiet for an hour. You don't need to be sat on the motorway just get on some open flowing roads. Just drive normal - no giving it death everywhere. You'll know straight away when the process has started.
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