I think it would be a bit of a rush, but not impossible. You certainly could do the Lancaster end to end (of at least Ribble Link basin to Tewitfield) in 2 days, but it seems like a bit of a rush, however the locals do like speeding you can act like a local and gun it. Whilst the Glasson Branch is only 6 locks, they are not exactly the easiest to do, so it would be better to spend a night in the Glasson basin if you can.
I believe they will try to do a cancelled passage the following day if possible, we were looking like having to do that for our up passage, but the wind dropped in the morning and we were able to go as planned.
Your boat does not sound ideal, so you may be too slow on the up passage at least, which means a diversion to Preston and complete the crossing the next day, so again that would be an issue if you are pushed for time.