69s

I think this is fine

According to balanced play we'd have to have about 20% bluffs in our range (Our opponent's getting 1 in 5 to call us down).

You're right that you've chosen about the optimal hand to bluff with, no SD value, decent equity/easy bluff.

Ranges would probably look something like this although it could go a few different ways

Combonator Output combonator.com
Board: 2 T J K

Combinations in complete range: 419 

[b]  Grouped[/b]:  155 combos,  37.0% 
[b]Ungrouped[/b]:  264 combos,  63.0% 

  [b]Group 1[/b]:  127 combos, 81.9% (30.3% total) 
  [b]Group 2[/b]:   28 combos, 18.1% (6.7% total) 

[b]Group 1[/b]: Pair of kings or better, pair of kings or better

KK+, JJ-TT, 22, AQs+, AQo+, K9s+, K8s (2), K7s (2), K6s (2), K5s
(2), K4s (2), K3s (2), K2s, K9o+, K8o (3), K7o (3), Q9s, Q9o,
JTs, JTo

[b]Group 2[/b]: King-high or worse with open-ended, king-high or worse with flush draw, removed 30 combos

97s+, 9h6h, 98o, 87s (2), 8h6h, 7h6h, 6h5h, 54s (2)

If you felt AJ was good enough for a turn raise you'd more than likely be adding some Q-high draw to your bluffing range to compensate

The numbers in brackets indicate weighted combos so 54s is 5c4c and 5h4h (peeled flop with BDFD, BDSD and option to bluff turn), and K8o is all combos w/ Kh.