Well, you're right that the functionality is different and that this solution is a fake workaround.
If you have a lot of fields, I guess the fastest way to do it, is to optimize you parent document for Form Field Detection before you export to pdf.
This might be of help:
Maybe someone else in this forum will provide you with a better solution.
Give each button the exact same name. Then for each button, go into its Properties, and under the Options tab, choose "check" for button style, and then assign a unique Export Value to each. For example, if you had three checkboxes for the choices "red," "white," and "blue," then you would give the export value of "red" to the first checkbox, "white" to the second," and "blue" to the third. This will make them function as mutually exclusive radio buttons.