Maybe setup two Windows accounts ?
You can use two local accounts, or use several Microsoft accounts, or a MS account and a local account. Both with different shortcuts and apps, of course.
If this is just a short term thing between contracts or while you are starting up then I don't see a problem.
Main reason I wouldn't want to use my gaming PC is downtime.
Work PC's are nice and stable, you install your software and apart from updates the config stays more or less the same month in month out
Game PC's usually have games been installed/uninstalled, tweaking to get games working.
Last thing you want is have to waste time working out why Adobe or whatever is now running slow when your supposed to be working.
This is less of an issue then it used to be but still a consideration.
Besides, if your registering your business then you should be able to claim a new computer on tax. No rules about which becomes your games rig and which becomes your work one 😉
Security wise I would consider it a nightmare. PC gaming involves running a lot of untrusted software; linking your livelihood to it isn't a great idea.
