I think it’s plenty workable. I agree about leaning into blapping. You could hop in and out if you need to to survive, but no major reason you have to.
Remember there’s a difference between “likes to be at range” and “doesn’t work well without range”. The only power in the latter category here is Cutting Beam. Which is pretty weak and poor with procs anyway.
You’re still getting fantastic S/T DPS with Beam in melee, and at least in melee you’ve got Psychic Shockwave shoring up Beam’s poor AoE.
Also fun fact, you’ve successfully paired the most -regen you can possibly get on a Blaster. Between Drain Psyche and Disintegrate, you’re beginning to compete with things like Heat Exhaustion or Benumb. The pylon time oughta look pretty good.
I have multiple builds on my Beam/Time and one has Future Pain / End of Time. It doesn’t feel wrong.