Just a personal opinion, as I am not sure if actual game statistics damage on a enhanced Flash Bat (or Crimson) sowrd is more powerful than the current Boss equips, especially Soki.
Though I think compare to the funds of forging with Willie's Stablizers and a long-time farming on the CTs, I think the Alts are more "affordable" than the highest boss unique. It is still a Gamble though. I herd from my friend who gave me the Crimson sword farmed the stats and slots dupes of the same weapon for forging with Stablizers.. And I think the motivation he had (using Ice Axe on a Primma) really put it off and did not spend to much on it. Again I can't be sure on the marketplace prices...
Plus, I like the Alt's because you can fuse to change it's image if you are not satisfied with a image like the Crimson sword. ^^;
I am working on mastering Lighting Strike, but due to school work and other distractions, I am not able to update this mess... BUT I (and ggFTWers who knew about hybrid Bunnies/Buffs) can still answer questions if available! ^^;