Old wheels in good repair are easy to find. Prolly cost less than a set of spokes. Often free with some hunting.
Wheel building is not tough and a new set of spokes and nipples ~$35, takes an evening if its your first ~$20 in tools
New wheel cost is more than the bike, but rife with potential.
? indexed shifter , down tube shifters you like? May be able to keep the freewheel, if you want.
Your call