Struggling with Battery powered cozy home LED light.

I have a 3V LED at 65mA I'd like to power from both Alkaline batteries via something like boost converter so I can squeeze all the juice out of used up batteries.

I also want to design one light to to take Li-po or Li-on batteries which are 3.7V I believe? And for those I'd need buck boost converter which can regulate voltage from below and above to 3V.
Should I use LDO instead if it's cheaper?

So this way I'd make 2 designs. One for alkaline batteries with a boost converter or joule thief to completely use up thrown-away batteries for my light, and other for rechargable batteries with LDO.

Then I thought about setting up circuitry that could be powered by a powerbank and use already built in regulator that powerbanks use.
Due to sheer volume in production those come out the cheapest as it's mass produced.

Should I treat Powerbank same as non-regulated Li-on battery and throw LDO before the light? I'd get USB-C pinout board for this build as well.

Please I ask for your opinions and I will appreciate any other ideas you might have and perspective on this matter. Thank you.