I have been using Huel for approximately 50% nutrition for the past few weeks and before that for about 25%. My concern is that if I were to go 100% then I may suffer from vitamin and mineral deficiencies. My logic is that some of the added vitamins and minerals are not as bio-available as the natural forms found in food. For example, Vitamin B12 (cyanocobalamin) has an absorption rate of approximately 2%. So this could lead to a B12 deficiency?
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To be fair the B12 content is a bit low. For safety, I supplement it on the side
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This is a reasonable concern, though there are a fair number of people who have had comprehensive bloodwork done on various -lent products, both before starting and some number of months into it, and their tests have all come back in the normal range. I’m unsure if any of these are specific to Huel, but there have been a fair few done on Soylent (which in my opinion has a far inferior micronutrient mix), and the only deficiencies there were vitamin D. There may be some bloodwork tests done on long-term users of Huel, but I am unsure.
The best way to see if you’d be deficient in anything is to get your doctor to do bloodwork now, switch to 100% for about a month and then have another checkup. This will highlight if your values of any nutrient have dropped out of the normal range, and you can supplement accordingly.
Also I’ve ordered my first Huel patch (as well as some creatine too, being vegan), I intend also to continue to take my daily Veg1 from the Vegan Society, which is what I’ll also recommend to any vegan here.
Apart from B12 and D3, do you mind if I ask why you would want to do that? Huel’s got you covered for iodine / selenium / the rest of the B vitamins.
+1 for creatine though 
You replied for yourself. B12 & D3. And convenience.
And mostly because some people, like me, don’t go 100% Huel. So we still need our RDA.