The weird requirements are there to satisfy impulses like yours: make sure that we only give welfare to the truly needy, and to make sure that their lives on welfare are not too good. The whole idea of UBI is to replace that with an unconditional transfer of a fixed amount of cash to every person.
If it's a fixed amount per person, people who choose less desirable housing will have more purchasing power for luxuries. I claim that any attempt to counter this effect will quickly devolve into another system of "weird rules," probably subvertible, and certainly with unintended consequences. For example, what if I am cohabiting and want to stop? Do I need to justify to the state that it must now house me and my partner separately at twice the expense? What if I'm faking the separation in order to rent out "my" apartment on the black market and keep living with my partner? What if I'm being abused? What if I'm sick of exurban Iowa and my "grandmother" "needs" me to take care of her in Haight-Ashbury?
The insight of UBI is that the government's attempt to untangle questions like this is doomed to fail, and attempting to do so is an unacceptable degree of interference in private life, so it should not try.
From what you're saying, I'm pretty sure you actually oppose UBI, and just want changes to the existing means-tested, strings-attached welfare system.