Not really. Your best bet is to reduce the autovacuum_multixact_freeze_min_age limit, so that vacuums are able to get rid of multixacts sooner (and/or reduce autovacuum_multixact_freeze_table_age, so that whole-table vacuuming takes place earlier).
Thank you very much. I will adjust those settings. Is there a way, something similar to keeping an eye on `age(relfrozenxid)`, that I can watch this and keep an eye on it before it becomes a problem?