The tithe is no longer binding
The tithe belonged to the Mosaic law and the Levitical priesthood. Hebrews 7 replaces that priesthood with Christ’s. The apostles never re-legislated a ten percent, so the tithe — and any fixed destination for it — is not binding today.
This proves too much. The ten percent comes from the same law as the storehouse — if one falls, both fall. But the principle predates the law: Abraham tithed to Melchizedek (Genesis 14:20), Jacob before Sinai (Genesis 28:22), and Christ affirmed it (“these ought ye to have done,” Matthew 23:23).
And the destination point stands either way: if the tithe binds, Scripture sets where it goes; if it does not bind, there is no tithe to redirect. The argument cannot have it both ways.