You have given the viewer a brave and sensitive insight into PD, particularly into mobility problems. You don't mention a tremor, so I assume maintaining movement Is the big challenge for you. I can see myself in a few years time experiencing much the same. While in one way I didn't want to watch, in someways forewarned is forearmed. Like the idea of the ceiling poles. My shuffle indoors is very frustrating, but I am lucky in being able to walk "normally" out in the open ( so far). Your theory on why wheelbarrow walking works is interesting - I can not walk and carry a bag of garden rubbish at all, unless I hoist it onto my shoulder like a coal-sack. Had thought it was to do with improved upright posture, but may also be about messages for less automatic big movements getting through from brain to muscle.
I am currently in France on a cycling holiday. Cannot do the major cols or larger distances now, but still enjoy the ambience etc. and up to 30 mile circuits. My personal challenge is simply to keep fit and strong enough to stay upright on my road bike for a few more years. I do have to be extra careful at road junctions and in traffic, and struggle to walk it/park it, (mind over matter, and counting or saying left right, left right helps). Have had to learn to accept assistance when necessary. So far so good!
So, keep up with the challenges, even if they take longer to achieve than planned. Look forward to your next video of you doing that triathlon! And more wonderful Welsh landscapes!
Best wishes and luck and thanks for posting the link. It worked OK for me.