Whats the cheapest way to get this look?

Post # 11 15" steel rims for (4") small bolt pattern?

I am wondering what is the cheapest alternative to getting the 15 inch wheel on the front of my 71 Swinger without changing the bolt pattern. Hard to believe that No-one has made a 15 rim over the years with the Dart small bolt pattern?

Is Stockton aftermarket my only alternative?

I have zero issue with running the stock drum set-up since its all in such good condition.

I have a set ( I think ) of these [SOLD] - red line dodge dog dish poverty wheel rim center hubcap cap set of 4 already removed from a 15 inch rim.

How about having my front drums re-drilled for the larger pattern, Im wondering if there would be any saving there.....enabling me to buy a more average wheel for next to nothing versus buying a custom wheel?

Re-drilling front drums?
The first move I'd make is to contact the poster of that post and ask about the pictures he posted up and what not.
IF i elected not to ask him directly or he doesn't get back to me anytime soon... There are 2 ways.

Purchase stock equipment and parts or go to the aftermarket and start hunting around.

Summit racing has a few things from Wheel Vintiques that would fit the bill. But maybe not the wallet since you did say and ask, cheapest way to achieve the look.
This is the route I'm going because , well,it's hitting the EZ button. Plain and simple.
15 inch 5 lug on a small pattern;
https://www.summitracing.com/search/brand/wheel-vintiques/part-type/wheels/wheel-bolt-pattern/5-x-4-in/manufacturers-wheel-series/wheel-vintiques-63-series?N=400230+4294920860+4294920795+4294909611+4294783131&SortBy=Default&SortOrder=Ascending

Poverty caps; https://www.summitracing.com/parts/wvi-2050/overview/
Trim rings; https://www.summitracing.com/parts/wvi-3002-1/overview/