FlatWhiteLover
Work is already drying up. Charles would probably take them back if they could no longer afford their LA lifestyle (after all Harry is still his son). But my god it would be a hard slog for the British public to forgive and forget, so it may be difficult for them to become working royals. A lot of bridges would need to be repaired but some may not be able to be mended.
I would be devastated if H & M returned to the UK in anything but a very private capacity where I didn't have to look at them or hear about them.
Apart from the bridge-burning they've done with the RF, they would never be allowed back into official life because they've proved themselves to be totally untrustworthy. The RF have to meet with military personnel, diplomatic staff, home and foreign politicians and heads of state etc etc. It's always been a given that any conversations with these people are confidential - but with H & M?? I don't think so. It's more than a 'redemption' thing - it would be an issue of national security.
Also, I don't suppose either of them is any more interested in the nitty-gritty royal duties of visiting unglam locations with very little (other than local) publicity. I'd hazard a guess that Meghan wouldn't want to do anything unless she could dress in 50K outfits and get photographed doing it.
Plus...Meghan wants to bore us with her awful word-salad speeches all the time, and royals aren't supposed to do that! Their speeches will be at least co-written and she would never be allowed just to spout her own stuff unregulated.
Their only motivation for wanting to pop back occasionally is to re-affirm their fading 'royal' status (but for me, they lost that when they went to the US - I do not buy the nauseating 'Duchess Meghan' stuff) and to pick up more supply for their self-publicity and material for further books, interviews and documentaries. The RF would be utterly mad to allow them back into the fold.
It would turn me into a republican!!! And that's saying something.