I'd take the money that was going to rebuild the 1.8 and build a plus size 2L and keep in NA.
But as you are determined to force air into the thing....
I'd follow Jonathon's old recipe for a strong low compression 1.85L engine.
1.85L 8V using 1.7L crank, Audi turbo rods, JE 82.5mm pistons, ported head with stainless valves,
Engine is 1.7L crankshaft, MC1 pistons, 1.8L block, ported head with the aforementioned stainless 41/34 valves, three-angle grind. Stock 1.8L cam, but we might switch to the shorter duration ABA cam for better midrange and torque. DBG admits that he seldom revs past 5K, so we will try to make the most of that part of the power band.
If I'm right, 1.7L crank is same stroke as Fox (86.4mm) however it use a 46mm rod journal instead of the 48mm like most VW. MC engine (2.2L 5-cyl Turbo) also use 46mm rod journal and also have a 86.4mm stroke and 81mm bore but use 136mm rod instead of the Fox's 144mm. More importantly, MC engine had forged pistons and stronger rods so the 1.7L crank let use the MC pistons and rods into a 1.8L block. This is a perfect low price setup for a turbo engine because it give you a 7.8:1 compression ratio and a stronger block.