I have been messing around with the exact same setup myself, close to a working state now.
So far, my solution is:
- 1 industrial 18-24V psu (dialed to 20V), mounted under the UM
- 12V regulator (marked IC1 on your board) replaced with a 12V DC step-down buck from ebay
- LEDs driven from this 12V line as well
- Heatbed connected directly to 20V PSU through Solid State Relay controlled by the UM Boards heatbed port (havent wired this up yet, but sounds like a common approach, exept maybe for using SSR instead of regular Rely)
I have an Ikea Led strip in my UM1 as well. There's a spot on the UM shield (1.5.6 at least) marked "19v LED" or something similar. I put a voltage regulator on there and ditched the extra cord.
For the hotbed you'll have to either disconnect the barrel jack on the PCB or solder leads to the legs or something, which are connected to your power supply. I haven't done this, but when I do I'm going to use a power supply dialed down to 19V like the UM is used to. Heated bed might take a little longer to hear up but I'm okay with that
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