Readings to use on a Sunday Solemnity (e.g., St. Francis)

[sr.christinaosf]

For us, as Franciscans, Oct. 4 is a special day.  We are observing the Feast (solemnity actually) of St. Francis Sunday at Mass since he is our founder.  I know, for the Church, overall, the feast is omitted but I believe our circumstances allow for us to observe it.  

However, the lectionary only provides one reading (first) for St. Francis.  Would we take the second from the Sunday or from the Common of Holy Men and Women (which is listed in the lectionary as a possible source of readings)?  I am not sure how this is supposed to work since there are always two readings on Sundays.  
Maybe we would be better off using the Sunday readings altogether?