Are these HTML buttons?
Create a Plain Text Attribute (max length 32,000 or so) for each of your buttons, in the description, paste your button HTML code.
Place the attribute on the form, hide label and show description on the right. The button will work with Appendix D. Links. And other's like save form etc.. (there is a forum post on javascript links)
Then use READ PROTECT rules to hide/show buttons on the form depending if Accepted/Rejected.