Mortgage rates vary wildly from lender to lender, but as a rough guide look at slightly less than half of what you were already paying on your 70%.
I would speak to a mortgage adviser who deals with whole of market ie, not one in a building society branch who will have a limited range of products to offer you.
If you sell your existing property for 100% of its value the 30% can be repaid from the purchase price or alternatively someone may want to buy your share and staircase themselves . At the same time you speak to a mortgage broker, it would be worthwhile speaking to a sales agent who has experience of selling shared ownership properties with stair casing. as you appreciate, stair casing matters are more complicated and not all solicitors will deal with the sale and purchase of them.
. I hope this has helped somewhat
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