[leegreen]

If you do decide to cut that headlight bucket up, check how the 'reflector' is supported for adjusting the headlight. I'd have to pull my headlights to check but I think that inner ring on the bucket supports the portion of the reflector held by springs.....so it may not be as simple as just cutting the bucket open.
Adjustability may not matter though with after market LEDs as they are probably just floodlights that annoy other drivers anyway (personal bias don't mind me)

GMCs had the park light under the headlight in fender, Chevrolet used the one in grill.

your plan to blink amber in headlight - does the headlight beam go off when that happens so the turn signal is visible?

I converted my in grill park lights to dual element with amber bulb so it is both park and turn, looks like 28tudorAZ may have done the same. I have sealed beams right now, but have a set of H4 shells on the shelf, past vehicles with 55/100 H4 were very drivable.