The developer has said he isn't really interested in supporting the use of EasyBCD in portable mode - and commented about running afoul of MS licensing re: WinPE.
I think it's a shame since helping to ensure the tool can simply run in a stripped down WinPE environment doesn't have any implications on MS licensing (i.e. he doesn't have top distribute his own PE just to run the tool, many options out there to build our own PE's).
I have had several situations where just having the ability to run EasyBCD under WinPE probably would have made short and Easy (pun intended) work of straightening out my boot issues (mostly caused by unexplained things that AOMEI Backupper does or doesn't do in either what they call a 'System' restore or a non-system restore).
As the alternative, I have not been able to solve these sorts of issues with using WinRE tools like bootrec, bootsect, diskpart, etc... and just using bcdedit manually is a bit of arcane science if you don't know what you're doing. So what to do...? Well, I was able to sort things out fairly easy through some trial and error using BOOTICE.
It's a bit cryptic and not very clear what some of the UI buttons really do, and I wouldn't experiment too much unless you're actually willing to lose data

. But if you backup your data, I'm fairly confident that this is the tool to address MANY of the same kind of problems under WinPE as you otherwise might have solved using EasyBCD. At least... in order to be able to fix 'problems'. EasyBCD is still WAY easier than BOOTICE to simply make modifications to an otherwise working bootable system.
Do remember, mqudsi has stated that EasyBCD isn't ~really a fix tool for a computer that won't boot - though it easily could be if we could run it properly under an external bootable PE.
I think he'd rather see ppl purchase EasyRE... can't blame him really.......
BUT - maybe try throwing all the EasyBCD binaries and libs through Dependency Walker? I'll try myself maybe... as I really do like the user friendliness of this tool.