This might work if you are a streamer or in a good squadron. What the motivation for those who like to transport cargo from A to B and build yours colony, and not their own, is unclear to me, + considering that credits have long been devalued
Then don't offer credits. Offer something of value to them. To start with, what do you value?
Before FD ruined it... people apparently had no idea how to find CMMs or Insulating Membranes. Apparently it was taking some hours to days to find what i could find in five minutes.
Would you take an offer to haul goods from my FC to my construction site for an hour, in exchange for not spending 8 hours sourcing CMMs and Insulating Membranes, because on completion I'd make multiple orbis worth of insulating membranes available to you where you like (Again, FD cooked that one now, so of course it's not workable anymore).
Some people don't have FCs, but want to build colonies still. Would you haul for my build, in exchange for me running a haul of goods in my FC to your build site?
Some people can't work out the system architect rules. Would you let me be the system architect and haul for my builds, in exchange for me setting things down according to your vision, tempered with the architects know- how?
And, some people do still want credits. Would you haul for me if i offered the goods cheap so you could turn near pure profit reach load? Would you haul 5000t of a good to my FC in the bubble, if i offered you access via friends/ dock for a 30,000cr/t markup on steel?
Of course, people might say "you can't force these things though! They could take them anywhere!"... trust is a commodity too, as much as time is. According to many, griefers are "the minority" in this game... so surely that means not many will betray your trust... but some still will. What's the value of 1 good contact in 10 bad ones, if they help you on the next 20 builds?
A lot of people here seem to value their time very highly... and some will value their time less.
E.g some people seem to insist that an outpost is an exorbinant time expense in the order of a week or more of their real life effort. Others think it's a casual 4 hours in one night Sounds like a customer and provider right there.
If you believe that, then there's a market to be had.
I had multiple people offer to help me with a build recently, simply by asking and identifying the value in the build.
Edit: question for anyone here too... how much would you be willing to pay if, say, I offered to build a coriolis in your system?