you don't need the microswiss hotend whatsoever. I'll get to that later.
but you can print PETG on a stock machine. what I would suggest is getting Capricorn XS ptfe tubing, which is much safer than stock at higher temps.
as for direct drive, I would worry about that if you plan on going to print TPU. for PETG, if you're ever going to get anything micro Swiss is to get this nozzle. it's plated tool steel. they have plated brass for less, but the plated keeps filament from sticking to the nozzle. a must have for PETG.
so you really don't need an all metal hotend for this. I've been making things out of PEGT this way for a long time now. but there is titanium heatbreak that turns the stock hotend into an all metal. printsleo3d has a video about it.