It would be a better fit to replace promtail and the loki ingester stack with grafana agent and to add Tempo into the MLA https://grafana.com/docs/tempo/latest/grafana-agent/.

This would reduce the processing and configuration impact on the MLA stack and add a new feature for distributed tracing. I would imagine the swap wouldnt be too difficult with the MLA gateway already configured for promtail to be modified to accept the agent and then to install the tempo chart as well