First off, yes, a changeling can qualify for Deepstone Sentinel by taking the Racial Emulation feat and turning into a dwarf.
Yes, I got the idea while thinking about my PbP character, but I'm not going that direction with him. I realised that the Deepstone Sentinel's signature ability (which creates difficult terrain around him) combined well with Morphic Reach and Combat Reflexes.
Here's what I'm thinking (quick build):
Changeling
1 Barbarian 1 (pounce, implacable variants)
2 Warblade 1
3 Warblade 2
4 Warblade 3
5 Warshaper 1
6 Warshaper 2
7 Warshaper 3 Morphic Reach
8 Totemist 1
9 Totemist 2 Feat:Extended ReachSS
10 Warblade 4
11 Deepstone sentinel 1
12 Deepstone sentinel 2 Feat:Open Chakra (shoulders)
13 Deepstone sentinel 3
14 Deepstone sentinel 4
15 Deepstone sentinel 5
16 Warblade 5
17 Warblade 6
18 Warblade 7
19 Warblade 8
20 Warblade 9
Shape displacer mantle bound to the shoulders and totem chakras (tentacle attacks and 20% concealment). Have a permanent extend tentacles spell cast on the displacer tentacles (as well as your morphic weapon tentacles) for 20ft reach.
Other possibilities:
Martial Study (any Devoted Spirit) + Martial Stance (Thicket of Blades)
Dwarven Defender levels