@gunchleoc @wandrecanada @tml @mathewi After installing a second keyboard/language layout, you can hold down right-Alt and Shift to switch between them (I have ENG and ISL installed and I just discovered that you can press the Windows key and space together instead). Then I just hit the accent key followed by the character I want accented. Alternately, you can pop up the on-screen keyboard (it can be complicated so search for it in the task-bar search field).
@EvilKiru @gunchleoc @tml @mathewi Yep all good suggestions. Alt-Shift was added to Win 8 natively and it's a very powerful tool for multi lingual support.
There were some earlier tools around as well but I haven't seen anything from the 90s when it was a pain point for me. I think there were some macro style work arounds?