That's basically what I've done. I was about to say I don't have thousands of sheets but just realized for 4x5 I have the following in addition to my open boxes of FP4, HP5 and Portra:
400 sheets HP5
300 Sheets FP4
400 sheets kodalith
200 sheets Ektapan
200 sheets Efke 50
250 sheets Tech Pan
200 sheets Maco IR (old 820 by Efke)