Here is what this armchair GM would do:
2019 Draft: 1st round, take best interior lineman available (O or D), even is Murray is available at 13. If Murray drops to the 2nd round (which I suspect, by the time we get to the draft, his stock will drop due to measurables), then you do whatever you can to get him. If you don't get Murray in the second round, then draft a prospect QB somewhere in rounds 3-5. Either way, you end up with a QB.
2020 Draft: move heaven and earth to get one one the top QBs in round 1.
After the 2020 draft, the 2019 and 2020 QB compete for starting time, and the other is groomed to either eventually start, or as trade leverage.