The SMS format is hardcoded to send Date, time, longitude, latitude, 'SMS text', value.
There is of course a way to get close to your desired result.
For example in configurator ManDown settings SMS text field type in the following:
Instant Movement %io51050, ManDown
Once there is a ManDown Event, the SMS message will not send coordinates, time and date, but instead it will send if device is moving and a ManDown text.
For more setting variations to send a custom SMS message, please visit our wikipedia page: How to Compose SMS text