Relative sizes of breakout options for 100 QFN, all 1x:

Option for smaller footprint 100qfn to PGA breakout:
requires
this press-pin

BGA to PGA breakouts, demonstrations of PCB's toporouter and hand-routing, 5/5/8 rules on 2 layers, 0.1" headers (shown 3x, 4x, and 1x actual size, respectively): (requires Mill-Max 3154 or 3157 series press-pin)

Multi-footprint breakout with E1 and gRX interfaces, shown 2x actual size, mostly 8/8/20 rules on two layers (6/6 between the two footprints):