[Python] Snakemake - Call multiple scripts in a rule

I have a snakemake rule where I call a python script with the script keyword:

rule merge_results:
input:
[...]
output:
path_results
script:
"merge_results.py"


However, I would like to also call an R script in this rule, depending on a condition. I wanted to do something like this:

rule merge_results:
input:
[...]
output:
path_results
script:
"merge_results.py"
if cond:
"my_script.R"


but Snakemake won't allow it. I know I could call my scripts by using the run and shell() keywords, but my python and R scripts use a lot of times the snakemake.input variable, so I would have to change a lot of things in their code in order to call them in a different way. Do you know if I can avoid that and use the script: keyword with multiples files ?

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