Going to Roubaix to build a frame...but what to build or the other side of the n+1 problem

So I'm going to Roubaix to build a frame and the more I think about I'm realising that I might just have all the frames that I need in my life a the moment (and in by me forseeable future).

So what do I have? I think that I'd list what I have to help find the gap

I have the following frames/bikes:
A Duell Professional fast road bike-rim brakes
A Lemond Gan semi fast roadbike (takes 28 mm tyres just fine)
An all-road Isen with disc brakes
A coupled Geekhouse cantilever travelbike
A Gan Well track bike with road disk fork (winter bike)
A Singular Swift mtb with eccentirc BB modified with eyelets for front rack and fenders
A Singular Peregrine mk3 all road thing
A Thorn Audax (current commuter/child carrier)
A classic french audax bike

So with all the information above I thougth that I would build a bike that:
*Built with with Columbus Life tubing (?)
*Pacenti Paris Brest fork crown
*Takes 32 mm tires and fenders with a caliper brake

• Has cantilever fittings for 650b wheels
  *Fork with ISO disc/canti/caliper fittings
  *Rear ISO diskbrake tab
  *PMW sliding dropouts (If i can find them in Europe...)
  *External routing
  *Fittings for DT shifters
  
• Front and rear rack fittings
  
  

So apart from this resembeling the bike version of the infmaous hamburger-french fries-calzone Carlskrove I´m afraid that this will be a classic master of none kind of situation.

The sensible thing might be to build some kind of gravel/allroad thing that could be used at my patners parents in Finland and would be used for road/ death gravel/overnighter-mix....

I really don´t knowq what to do. Please help!