That's quite a load of legacy baggage. If your first reaction to a new system is "how do I get my old environment?", you may be missing the point. You need two shells, two editors, and a specific (gigantic!) compiler?

There's a vi for Plan 9 (even skipping the old joke about the MIPS interpreter...). I think it's vim, but I haven't paid much attention. David Hogan did a gcc port, and mostly nobody cared so it languished.