Next time take it to a truck stop shop, for semi repairs.
They have the bead seating tanks.
They are filled to 160 psi, and exit out a 2" ball valve very sudden, and strap as well to assist.
I tried the ether, and didn't have much more than a fire at 30 below 0.
A box of M-80's may have worked better.
In your case out too far from tire service, I'd just get any inner tube that
can be shoved in it to get it done. Then after it's been on a while, then use metal valve stem.
I may even use a tire gel to self seal small leaks.
Cleaned up rust at bead of rim if any, then I apply over pits on rim with 3M yellow trim adhesive, fully cured, then seat the tire.
That's the last time it slow leaks.