I did similar a few years ago. Time and kit had moved on in the intervening 25 plus years, but the basics are still the same (despite what young people may tell you)!
In my case I wanted to use a Brompton instead of a regular bike. I sorted through my old kit to see what was still useable: Trangia, bedding mats, sleeping bag, mugs and cutlery. I had two large Saddle bags, One I molished to fit a Brompton front rack, the other I mounted on a Carradice SQR. very basic tentage was a bit cheap and bulky, (I bought a Banshee 200 in the sales) but I added a seat-post rack for trial #1
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Note - Brompton and all bags in tent!!
Trial #1 was a 60 mile ride from Abingdon to join a regular yacf meet-up camping at the back of a pub near Rugby. Having all day to get there the distance wasn't an issue, there were bail-out options if it all went wrong. Meeting-up other cycle-campers meant that I'd have plenty of help and advice if I needed it.
I didn't really need full kit and caboodle, but this was a test-run.
All worked well, the Brompton would need the gearing lowered for future trips.
The next trip was the same venue with the same folks etc. but I took a novice friend along and we went on proper bikes. Still full kit with some minor editing.
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The Rourke was not designed with touring in mind, but was OK. This sealed the deal for lowering the Brompton gearing and using that as my main fully-loaded tourer.
In the meantime I refined/reduced my kit and planned a trip bivying/hostels in the Outer Hebrides!
Cycling shoes were ditched in place of walking shoes. Lighter/dual function clothing was sourced, Bivvy bag, lighter/warmer sleeping bag, tarp, inflatable sleep mat. Bulky Trangia replaced with pocket-stove, meths replaced with Esbit solid fuel, 600 ml MyTi mug for heating duties. No beam-rack required. Downsides of the OH is you need to carry quite a bit of food as shops are few and far between and closed when you most need them!
Flexibilty was key, when possible I wild camped alone or outside a hostel to use facilities. I also stayed with a couple of friends.
All in all, it was brilliant! I've since bought a proper Brompton T-bag for future use instead of the molished saddle-bag on the front rack.
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Since then I did the lighweight (credit-card) 'Friday's' Tour and incorporated the Ghent Jazz festival into the schedule requiring some semi-decent clothing.
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Like most people I tend to overpack and then refine for the next one. Using lightweight, quick-drying multi-functional clothing is a big win. Cycle specific stuff adds extra bulk, so you save if you can ride without it or use cycle-underpants under regular shorts. Flip-flops for evening/camp use etc.