It's fine, I've seen numerous people recover on nolva only, 20 mg ED for 4 weeks is the standard used for avarage length and dosed cycles.
Define rebooting the HPTA? If you're refering to getting LH and FSH back up so the testes get stimulated to produce testosterone, then tamoxifen does that as well. Moreover, Vermeulen et al. hypothesised that it might stimulate the gonad directly, as it showed an increase in testosterone, with no change in basal LH and FSH in a short duration trial. Furthermore, it even raises T in hypergonadotrophic individuals, suggesting the very same (Kadioglu et al. 1999).
And chemically they are of course closely related, they both share the same triphenylethylene backbone and the N,N-diethylethanamine side chain. I attached a picture of the chemical structure of both compounds, since a picture says more than a thousand words of chemistry.
Note; I'm not advocating tamoxifen above clomid.