I've fancied having a Wannen tender and single large sandbox-equipped BR50 for years in N scale.
I've considered converting a latest-specification Fleischmann N Kriegslok to represent 053 097-2, which I saw at Lauda in 1973 and understand was in use on the Koblenz-Trier Moselbahn at various times.
It would be nice if Fleischmann did 053 097-2 but they don't: in fact it would be nice if they produced more DB late-epoch III-early epoch IV Br50 variants with different cabs, dome/sandbox arrangements etc.
I would welcome comments on the feasibility of such a conversion, I would imagine new numbering would be the least of any problems involved.
I noticed a Fleischmann N scale Br52 at Intermodellbau Dortmund last year, loose and unboxed, for about Euro 140. I was sorely tempted!