If it were me, I'd go with one of these options:
1) Redline tires. You can go with the BFG radial redlines ... which are available in metric sizes, look just like tread pattern of BFG Radial T/A (only redline instead of RWL). You can go with old school bias ply Firestone D70-14 or F70-14 redlines tires. You can go with the new radial Firestone F70-14 (FR70-14) that are radial tires but look just like the tread pattern of the old bias plies. Not available in D70. These are all in the $250 - $330 per tire range, unfortunately.
2) Go with the tried and true BFG Radial T/A in RWL. It's been the go-to radial tires for about 40 years now. Not especially unique, but they always look good and sort of period-correct. I think these will be in the $175 ballpark.
3) Go with something even cheaper. I think there are some Uniroyals, too, that some people use and is a sort of classic.
And, I'll throw this in. For years, Mickey Thompson Indy Profile tires were sort of a cool, performance bias ply tire with classic RWL look. Those went OOP a decade ago (or more). However, I did see that MT has a radial tire out there. I don't know what sizes it's offered in, though. I have zero information about it, other than it exists in some capacity:
