"albeit then" is correct and usable in written English.
You can use it to introduce a comment or idea that contrasts with a previous one, or to acknowledge that an earlier comment was valid while qualifying it in some way. For example, "Most students prefer online classes, albeit then they are more difficult to stay motivated in."
What the period does show, however, is a leader, albeit then of just a minor city, who rarely let the real world get in his way.
Even if she were to become incapacitated, she would still remain monarch, albeit then with her immediate heir taking over her constitutional duties as Prince Regent (exactly as happened in the final years of the reign of George III).
And I am thrilled that it voted to admit women last year, before the new Harvard policy with its attendant sanctions was announced (albeit then fully aware of the University's strong opposition to gender-restrictive clubs, and the Dean's moral jawboning backed by serious threats to do something about them).
"As a Forest fan of 20 years, albeit based then in London and now overseas, I never really hated the sheep (aka Derby)," confesses Simon Frank.
Try a Helios, the house take on the city's own style, albeit unfiltered, then sample something few other Cologne brewers would even consider: an Alt, the traditional brewing style of the city's longstanding rival, Düsseldorf.
The piracy epidemic is also spreading to the US and Japan, albeit slower then in Europe.
But they are proceeding in that direction, albeit "slower then they anticipated".
And of course they're custom-made: Jay-Z did admit to Oprah, albeit jokingly, "Then at the end of the day, I just know I'll probably have the worst, spoiled little kid ever".
We found that, for two different tasks, human subjects learned these expectations, albeit imperfectly, then used them to make decisions in accordance with the normative model.
(Albeit, the burning question then would be: in VR would anyone be able to tell if you're a dork in real life too?).
But they were almost unanimous in the direction to take: first down and then, albeit hesitantly, up.
