Toning between the Highlights

Hello friends... it's been an extremely long time since I visited here!  But that does not mean I've refrained from playing with haircolour and hair products - quite the opposite in fact.  I learnt so much here that I think I know what I can do safely, and sometimes I'm doing touch-ups every weekend.

I'm loving my hair length, and though it grows very slowly, it's reaching a length I've never seen before - primarily due to silicone-free conditioners, micro-trims, keratin treatments, and a product I more recently discovered, Olaplex, which I know has been met with mixed reviews.

Anyway, I have a question that I probably already know the answer to, but it's worth asking in case anyone's got any good tips.  At the moment, my hair is rather light in the lengths, some highlights running through the lengths and around the crown (not professional, mind you, but I do my best!), and at the roots, a very neutral grey, thanks to Colour Freedom Metallic Glory box dye at a relatively safe 20-volume (those shades are a long-time coming!).  It's the effect I've been after for a while now, but toning is going to be the challenge.

The highlights in the lengths are easy enough to tone, as they're probably nearly, but not quite, banana-peel yellow.  The problem comes with those areas that are between the lightest and darkest areas - those bits that have been bleached at some point and are still an orangy tone.  You see it if you lift the hair at the back and sides, but it's a bit interspersed as well from all-over highlight effects.

Has anyone come up with an easy way of neutralising those orangy tones without having to foil or separate out the very light pieces?  I've gone back and forth so much in trying to paint on semis just in the right areas, but it never quite works.  The one product that did work was a mid-toned metallic from Colour Freedom I tried a couple months ago, but it got everything a bit too dark, and their lighter tones don't cover or lift enough.  Plus, I'd rather use semis because the less peroxide, the better.

If no other solution, I may have to use the sectioning method with a stronger blue-purple semi, or tone out the yellow with purple toner and learn to live with the orange, or go darker in the areas that I don't want to darken - which I've tried several times before!

Thanks in advance... and "hello" to those who remember me.  *hugs*