Manifold & Midpipe separating under throttle

[MarvinNC3]

1. My model of MX-5 is:
   2013 Venture Edition 2.0 PRHT, 83,000 miles

2. I’m based near:
   Brentwood, near London

3. I’m looking for technical help or recommendations on:
   Manifold Catalyst Destroyed

I’ve managed to destroy my exhaust manifold catalytic converter, a big old chunk of it dislodged and dropped into the midpipe.

I’ve removed the remaining debris of the manifold catalyst, so now I have 2 options I’m considering. I either get BBR to fit their catted manifold for £1000, or I temporarily get a remap to teach my car to run fine despite a missing catalyst.

If anyone knows somewhere that could offer a cheap but reliable remap please do let me know, any guidance is appreciated!

Cheers,
Callum