The only way you could do it under the current regulations is to open only one turnstile at each of the four corners of the ground and let fans in single file.
Section off the concourses at the mid points. Mark which seats are available and trust the fans to fill them in the right order. At full time fans would have to go out row by row.
Not sure how you stop the "I need the toilet" brigade though
It would a lot of patience from the fans though, including wearing masks, which should increase the noise from the West Stand