What we need with acrylic is a good method to attach it to epoxy. We need a sealant that forms a good bond to both or an intermediate layer. For example how about using weld-on to attach some plastic to the acrylic, and then silicone to attach that plastic to epoxy. Or, if epoxy bonds to acrlyic, just make epoxy putty and use that instead if silicone.
post pics of your build to