To some extent, I ditto Jackson.
But do bear in mind that due to the increased weight the horse will carry, there may need to be some adjustments to the management. For example, the saddle should ideally distribute the weight of the rider over a wider surface area - so perhaps look into treeless saddles or endurance type saddles and you may find the horse will need to be seen more regularly by a chiropractor or physiotherapist to keep them able to enjoy their work
However, I stand by what I said earlier, you have done extremely well and there is NOTHING to stop you buying and enjoying your own horse - I wish you all the luck in the world trying to find your perfect equine partner!
ETA: Have a look at Cleveland Bays. They are big but still agile and just beautiful. They are on my want list!