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Yeah, this was an 800+ quid proposition (extra because I didn't factor in 2 new BBs) that I'd been considering for years, really. I ended up justifying it because the missus "needed" compact cranks and I needed to not be doing 600W every time it hit 28%.
I looked at those alternate chainrings for her bike (she had Ultegra cranks) but this way I get my lower/better gearing and she gets a free powermeter with her compact cranks.
I've been contemplating this for a while, but I need to find the will to switch back to 2x.
Best option with out the need for a new crank is -
https://www.ebay.co.uk/itm/bikinGreen-CNC-Chainring-46-30T-FoR-Shimano-4-Arm-10-11Spd-Road-Cyclocross-Tour-/323846025801