I don't think i saw anywhere on the wiki that anything will limit a 1 bard from attaining max Fascinate DC. With just 2 skill points each level to perform. He will only have 2 songs (+1 from enhancements) but can regenerate with Anthem.
Another alternative is to go 6 bard and Virtuoso 1 to further allow fascinating constructs/undead & enthrall.
Anyone try similar bard splashes? Ive never tried a rogue but thinking the CC would help. 18 rogue/1 ranger/1 bard or maybe 14 rogue 6 bard for more healing.