Too bad the T5 isn't just a big version of the T3. I like the momentary clicky of the T1 and T3. Try a Striker VG for a multi-level momentary thrower that takes 17670's for a rechargeable solution. Or a CPF VB-16 as noted below.
Some single CR123 momentary lights are the aforementioned T1, Surefire L1, the new version of the Q3, and the Nuwai ALX2611, plus the Peaks you mentioned.
Some alternative/modded solutions: LeDean's MMMMag CR2 with a Kroll switch added, HDS EDC Ultimate in Tactical Momentary mode, Fenix L2P with Nekomane CR2 or CR123 tube and Oregonshooter's momentary mod kit.
Multilevel lights with momentary: SureFire A2, L1, L2, LED Logic Striker VG, the aforementioned HDS Ultimates, Flupic/POP modded new Q3, Night Ops Gladius. The CPF special VB-16 from Wit's End can be used as a momentary though it doesn't have an actual switch, the tail cap loosened just a little works very well - and results in a momentary switch that won't break. If you had been lucky enough to get in on the (now closed) list for a certain 2-stage mod, you could have a momentary Peak with 2-stage like the SF L1 in a smaller light. BTW, keychain body Peaks with the keychain post that unscrews should all take the momentary switch. Check with Peak, their service will help you.
If you can use other than CR2 or CR123: Eternalights, MiniMags with Flupic or other multistage PILs, LRI Proton, Jil Lite with CAB (1AA body) and Kroll, Photon Freedom.
The one I see that are in both categories is the SF L1. Get a SF F04 beamshaper and you will have a very good light for all occasions. Though it is the biggest 1xCR123 light made...