Good question, within the Synod, our bishops and presbyters are free to use whatever rite in their parish that best fulfills the needs of their congregation. The SST does have it’s own rite that is a mix between east and west, and when we are together we use that Rite, however, when functioning within their own parishes the bishops and presbyters have the authority to use that rite which best meets the spiritual needs of the people in their congregation. For some it’s the Eastern, for others its the Anglican, and yet for others it is the Latin Rite most notably the TLM, but others also use the Novus Ordo, but find some of the things disagreeable. So if the changes were made to the current Mass, our presbyters that desire to use it will adjust.
The Synod of St. Timothy is not a homogenous group of people but rather a heterogenous group of people who have the same basic Catholic beliefs.
Their motto best sums it up:
Unity in essentials. Diversity in matters of doubt. Love in all things