Eligible Cars for Showdowns

Aside from the obvious e.g. championship SD always features the PC car and the previous MS car & elite SD always features the current timed tuner car, are there other patterns that NM follows? And do you know if:

• recent timed tuner cars like the Nismo Z and Lambo Aventador will come back in future elite SDs as eligible alternative choices?

• cars like Pista Spyder and S7 will continue to be alternatives for the elite SDs, what other cars have been regular alternatives in the past, and for how long?

Reason for asking: I’ve prioritised spending elite tokens on the timed tuner cars, but want to focus on elite maxing some of the tuner cars in collections instead eg Mustang GT, F1, etc. And, I’ve been getting 10% discount crates on the timed tuner cars tuners only, so wondered if it’s worth buying the Pista Spyder and just using that instead during the next series of elite SDs that run with the next timed tuner car in March