The costs of film photography seem prohibitive to me for a beginner, even if there is probably a lot to learn from this practice, especially in that it leads to thinking before pressing the shutter button.
As for the X-PRO1: it was when it was released on the market near the frontier of the available technology. This is obviously no longer the case but it remains a fabulous camera body that over the years has received significant improvements such as the "focus peaking". The latter is in my opinion the most suitable of the aids to focusing, especially manual.
From your orientation towards the Fuji X100 or XPRO, we can suspect that you want to have an optical viewfinder. If this is not the case, I see little point in looking for one of these models because of the extra cost involved..
However, there are two things to consider:
1/ The electronic viewfinders are from a few years ago quite satisfactory, and if in second hand, you will not have access to the most amazing, they are quite sufficient for a normal use.
2/ The optical viewfinder of the X100 or X-PRO is very different in nature from that of a DSLR of the X700 type.
It is close to that of a range finder, and if it has advantages especially in street photography or in similar styles, it also has disadvantages such as parallax offset.
While the viewfinder of the X-PRO and X100 have guides to take this offset into account for lenses adapted to the X Series bodies, this is not the case, with some exceptions, for lenses mounted via an adapter ring. Indeed, it is necessary for the camera to know the shooting distance to correctly place the guide in the viewfinder.
Incidentally, focusing aids, whose focus peaking mentioned above, also do not work in optical viewfinder mode.
As far as the sensor is concerned, the 16M pixels it proposes should be enough for many.
Don't let my answer discourage you a priori. If your photoqraphy enters the perimeter where the X-PRO excels, it's probably a good choice.
Disclaimer: I was unable to part with my X-PRO1