I'll look at level 10.
13 ranks max, but we'll likely be leaving a lot of knowledges at rank 10.
Let's assume that we had a base Int of 18, and were playing Illumian, without an item familiar. At level 4 and 8, boost to int.
Skills at level 1: 32
Skills at level 2-7: 8/level -48 total
Skills at level 8-10: 9/level -27 total.
Total Skill points: 107.
Truespeak: 13 ranks
UMD: 13 ranks
Knowledge (any): 11 ranks
Knowledge (7 others): 10 ranks
This makes getting the +10 bonus from paragnostic assembly easy (+16 for 10 ranks in 8 knowledges, +5 for 10 HD, +1 for class levels with knowledge in 3 class =22... find a bit more and you're good.)
On truespeak:
Assume the +10 amulet, as well, and that's a +22 without ranks. +6 int item, and you're up to +30. Add on ranks and you're up to +43. Skill focus + MW Item puts you at +48.
Not bad. Against a CR 10, you're looking at DC 35 checks, so even quickening has a decent shot at first. 95% if you boost all skills by 5 first. 100% if you're targeting yourself at that level, and you boost all skills by 5 first.
But that is a significant amount of optimization. More than typically goes into UMD cheese.
That said, your knowledge checks will likely be impressive (+30ish, for a nearly guaranteed ID of anything with 20 or lower HD, and a +4-5 range for knowledge devotion) -this assumes Hidden knowledge utterance.
Assume the most powerful Word of Nurturing? And you're looking at 6d6+5 damage per round, and likely 4d6+5 as well.
Combat would likely be:
R1:Utterance +5 to all skills
Quicken Utterance +10 knowledges
Knowledge devotion on everything.
R2: Quicken Seek the sky on self, fly somewhere
Post powerful Reversed WoN on enemy - 6d6+5 damage
R3: Concentrate on WoN - 6d6+5 damage
Quicken 2nd most powerful WoN - 4d6+5
R4: Concentrate, 2nd most powerful - 4d6+5
Quicken most powerful WoN -6d6+5
Move somewhere.
Note, you can maintain an average of 45 damage per round after round 2, and 26 on round 2. Not bad, but that's a LOT of resources for modest damage. Yes, it can ignore SR, but with quicken? That's a tall order, without item familiars. With item familiars? It's doable.
So SR may be a bit of an issue, but if you're willing to sacrifice damage and not concentrate, you could keep up 26 per round reliably on it (6d6 + max from Knowledge devotion, which will happen more often than not).