I have been doing teaching work in my field (i.e., language/linguistics) for several years while at the same time conducting and publishing research (I am from a developing country). All of these projects have been collaborative, with two being conducted alongside two different professors. Now, I feel I am ready to apply for a PhD but one of the professors, who is also abroad, is keen on doing a couple of more projects with me. I am concerned and ambivalent about this for two reasons:
The first project we did together was relevant to my research interests/expertise and my role/contribution was clear there. But, the new projects are at best tangentially relevant to my interests and future research area. I am worried that conducting research on such topics could mean (to a potential PhD supervisor or graduate admissions committee) that I am somehow intellectually disorganized or still undecided about my main interests.
Relatedly, I am concerned that reporting even more collaborations on my CV at this stage may put off potential PhD supervisors who may become suspicious of my commitment to their program or think my attention will be divided.
Is there any validity to these concerns? Or, am I just passing up on a good opportunity to expand my research profile?