There is some controversy concerning if acetone degrades tren or not. I am no chemist but I have heard more knowledgable people say this is true. I think chemo has stated this is true, but please don't quote me on that.
I would certainly try to dissolve the pellets and filter out the binders and then let the solution evaporate leaving tren behind. You can try to strip the acetate but most who try this have little success and the benefit may be outweighed by loss of product. You could use methanol (yellow heet bottle) to dissolve the fina and filter through a coffee filter one or twice, rinse the filter with more heet, wring the filter repeat and then let the heet evaporate leaving the tren behind. You can add water drop by drop or ice periodically to the heet/tren solution to reduce the loss of tren as the heet evaporates. Heet can be picked up in auto parts store or hardware store. Just my .02