There are no short cuts with truing the Action. If you don’t have a proper lathe & tools, it can’t be done.

That said, truing isn’t the end all, be all. I can’t tell you how many shooters I’ve seen go through the motions sending their rifles or Actions to a Gunsmiff, pay the cost, wait the months it took, only to have their rifles shoot identical groups it did before being Trued. If you already have an accurate rifle, it’s components are likely pretty darn true! And it’s unlikely it would see much, if any improvement. I don’t worry about having rifles trued because I’m not looking to shoot <1/4” groups! Rather, my eyesight won’t. But I think if more people were honest with themselves, let alone everyone online, they’d find their own skill level isn’t tiny fractions of an inch either.