Best way of starting RX stream from PPS

I wish to have RX stream start based on PPS signal, is it possible to deassert LMS_RXEN and then assert it triggered from the PPS on a gpio ?

Does this complicate setup as all registers are lost ?

Or intercept the data valid from RFIC to BBIF ?

Ideally want to have the sampling start as close to the antenna as possible for determinism etc