I agree with your assessment. I think "thea" is such a pretty element, and I like the awkward forced elegance of these latin-styled feminizations of male hebrew names. Although of course, Timothy was actually original Timotheos, so Timothea does have an ancient old form. Thinking of it as a variation of Timotheos makes it more coherent as a name.
I'm not sure I appreciate any of these combos. I think Sibyl, Blanche, and Daisy come close. Daisy comes very close, and if they weren't both "green" for me I think I would like it.
For myself, I might be so dull as to just say Timothea Rose. Timothea Hestia sort of appeals, I feel they share a similar kind of antique delicacy that makes the awkward length work.